KR20070037673A - Working machine - Google Patents

Abstract

An object of the present invention is to simplify the structure of the door closing stopper so that the engine cover can be easily opened and closed with only one hand and the burden on the operator can be reduced.

A stopper accommodating portion 21 fixed with a door closing stopper 20 for holding the engine cover 14 in a door closed state via a support member 24 or the like to a support 8D of the structure cover 8; The stopper member 27 provided in the reinforcement board 14G of the engine cover 14 via the bracket 25 is comprised. When opening the engine cover 14 from the door closed state, the entire engine cover 14 is bent and deformed by an external force that lifts the handle 18 of the engine cover 14 in the door opening direction. Then, by using the bending deformation of the engine cover 14, the stopper member 27 of the door closing stopper 20 is moved in a direction away from the locking fixing portion 21B of the stopper accommodating portion 21, so that both of them are locked. Release it.

Engine cover, stopper, bracket, strut, gusset, latch

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 shown in FIG. 1 from above. FIG.

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

4 is a perspective view showing a state in which the engine cover is held in the door open position in FIG. 3; FIG.

Fig. 5 is an enlarged sectional view of the opening of the structure cover, the engine cover, the door closing stopper, and the like as seen from the arrow V-V direction in Fig. 3;

FIG. 6 is an enlarged cross-sectional view of the door closing stopper and the like in FIG. 5; FIG.

Fig. 7 is a sectional view at the same position as in Fig. 5 showing a state in which the engine cover is slightly opened.

8 is an exploded perspective view showing an enlarged view of a stopper accommodating portion, a supporting bracket, a stopper member, and the like of a door opening stopper;

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

1: hydraulic shovel (working machine)

2: undercarriage

3: upper traveling body

4: working device

5: turning frame (frame)

6: cap

7: counter weight

8: Structure Cover

8A: Side Cover

8B: Top Cover

8C, 8D: Shoring

8E: Connection Beam

9: opening

10: engine

11: heat exchanger

12: cooling fan

14: engine cover

14E: Rear Plate

14F, 14G: Reinforcement Plate

16: hinge

17: sealing member

18: handle

19: lock device

20: door closed stopper

21: stopper housing

21B: Jam Lock

22, 28: Bolt

23, 26: Nut

24: support member

25: bracket

25C: Stopper Insertion Hole

27: stopper member

27B: Combined Hooks

[Document 1] Japanese Unexamined Patent Publication No. 2001-323507

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine suitably used as a construction machine such as a hydraulic shovel, a crane, a wheel loader, a fork lift, or a transport 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 for accommodating a power source such as an engine therein. In addition, an opening for inspection is provided in the upper part of the structure cover to maintain and inspect the engine in the machine room, and the opening is covered with an engine cover (bonnet) so as to be openable and closed (for example, refer to Patent Document 1). ).

Moreover, in order to hold | maintain the engine cover in the closed state (door closed state), the said door cover stopper which consists of a fixture called a catch etc. is provided between the said engine cover and the structure cover. The catch called the catch is configured by using a handle, a hook, and a locking shaft, and the hook is fixed to the locking shaft installed on the engine cover side by rotating the hook with the handle installed on the structure cover side. To secure the engine cover in the closed state.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-323507

By the way, in the above-mentioned working machine according to the prior art, the engine cover is held in the door closed state by using a so-called catch (door closing stopper), so that every time the engine cover is opened and closed, The operator needs to rotate the catch with a fingertip or the like, and there is a problem that extra effort is added to increase the burden on the operator.

In this case, the operator of the work machine rotates in a direction to remove the catch from the engine cover by, for example, a fingertip or the like, before lifting and opening the engine cover which is in the closed state of the door upwards, and the engine by the catch Unlock the cover. After that, the operator changes his posture to change direction toward the handle side of the engine cover, and in this state, an operation of lifting the engine cover in the door opening direction while holding the handle strongly is required.

For this reason, the operator has to require complicated operation (operation) from the door closed state to the door opening by using both hands to change the working posture appropriately, thereby reducing the burden on the operator.

In addition, in construction machines such as hydraulic excavators, the top position of the structure cover becomes a high position of 2 to 3 m (meters) or more from the ground, so that the operator places a narrow scaffold to the position of the catch when opening and closing the engine cover on the structure cover. There is a problem that the burden on the operator is increased by this, since it is necessary to approach through and the operator must take sufficient care not to accidentally fall from a high position on the structure cover.

In addition, the catch as the door closing stopper used in the prior art is constituted by using a large number of parts such as hooks and locking fixed shafts, as described above, which results in a complicated structure and increases the unit cost per catch. There is also a problem that workability when assembling and attaching the catch between the cover and the structure cover is bad.

In addition, in order to install the catch used by the prior art in the height direction of an engine cover, it is necessary to make the height dimension of an engine cover larger than the full length of a catch. However, when the height dimension of the engine cover is increased, there is a problem that rear view from the cab is blocked, thereby making it impossible to secure a wide view.

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 operate the door by simply operating the engine cover by using only one hand, and to make it possible to reliably reduce the burden on the operator. To provide.

In addition, another object of the present invention is to provide a simple structure of the door closing stopper to improve the workability at the time of assembling and at the same time, to reduce the height dimension of the engine cover, for example, to widen the rear view from the cab. It is to provide a working machine to secure.

In order to solve the above-mentioned problems, the present invention provides a frame of a vehicle body on which a work device is installed, an engine mounted on the frame, and a structure cover provided with an opening at an upper side by enclosing the engine from outside and vertically installed on the frame. And an engine cover installed on the structure cover to cover the opening of the structure cover, and a door closing to hold the engine cover in the closed state when the opening of the structure cover is closed by the engine cover. It is applied to a working machine provided with a stopper.

In addition, a feature of the configuration employed in the invention of claim 1 is that the door closing stopper is fixed to the structure cover side, the stopper receiving portion formed to be elastically deformable, and fixed to the engine cover is coupled to the stopper receiving portion The stopper member is configured to be detachably coupled to each other, and the stopper member accommodates the stopper by using an elastic force that is flexibly deformed by the engine cover by an external force when the engine cover is lifted in the door opening direction from the door closed state. It is in the structure which cancels the state of engagement with a part.

According to the invention of claim 2, the engine cover is provided with a hinge on one side in the longitudinal direction, the hinge being a rotation support point when opening and closing the engine cover on the structure cover, and opening and closing the engine cover on the other side in the longitudinal direction. The handle gripped during operation is provided at an intermediate position in the width direction, and the stopper member of the door closing stopper is disposed at a position spaced apart from the handle in the width direction of the engine cover, and the stopper accommodating portion covers the engine than the stopper member. It is arrange | positioned at the position used as the width direction outer side of the.

In addition, according to the invention of claim 3, the stopper receiving portion is configured to have a locking fixing portion that is bent from the position of the rear portion side of the vehicle body of the opening of the structure cover to protrude upward, the stopper member is the stopper accommodating It has a structure which has the engaging hook part which bends in the reverse direction with the latching | locking part of a part, and couples and couples so that engagement and detachment are possible.

According to the invention of claim 4, the engine cover is provided with a bracket having a stopper insertion hole extending from the outer side in the width direction toward the inside of the engine cover, and the engaging hook portion is inserted into the stopper at the tip end side of the bracket. The stopper member is provided to be fitted into the hole, and the stopper fixing portion of the stopper accommodating portion is inserted into the stopper insertion hole of the bracket to engage the engaging hook portion of the stopper member when the engine cover is closed by the door. have.

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

1 to 8 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 is pivoted on the crawler type lower traveling body 2 which can run on its own, and the lower traveling body 2 as shown in FIG. In the upper revolving body 3 mounted as possible, and for the work device 4 installed in the front part of the upper revolving body 3 so as to be excavated for excavation work such as earth and sand. It is roughly composed by.

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 composed of 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 revolving structure 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 is a swing frame constituting the support structure (frame) of the upper swing body 3, the swing frame 5 is installed on the front side so that the work device 4 can be moved buoyantly, the rear side will be described later The counter weight 7 is provided.

Reference numeral 6 denotes a cap that serves as an operator's boarding portion disposed on the front left side of the turning frame 5, and the cap 6 partitions the cab therein, where the operator seats, the operation lever, and the operation pedal ( Not shown).

Reference numeral 7 is a counter weight provided on the rear end side of the revolving frame 5, and the counter weight 7 is mounted on the rear end side of the revolving frame 5 in a detachable manner, with respect to the work device 4 on the front side. The weight balance of the whole upper pivot 3 is taken. Moreover, the structure cover 8 which accommodates the engine 10 etc. which are mentioned later is provided in the front side of the counter weight 7.

Here, as shown in Figs. 3 to 6, the upper plate 7A is fixedly installed on the upper surface side of the counter weight 7, and the upper plate 7A constitutes a part of the counter weight 7, The upper surface is disposed on substantially the same surface (height position) as the upper cover 8B described later. The upper plate 7A provides a flat seat surface for the engine cover 14 together with the top cover 8B when the engine cover 14 described later is closed.

Reference numeral 8 is a structure cover positioned between the cap 6 and the counter weight 7 and installed vertically on the swing frame 5, and the structure cover 8 is a steel plate or the like as shown in Figs. It is formed by using a plurality of metal panels, and the machine room is partitioned therein. The structure cover 8 is constituted by side covers 8A and 8A provided vertically on the left and right sides of the revolving frame 5, and an upper cover 8B and the like provided on the upper side of each side cover 8A. .

Here, the upper cover 8B of the structure cover 8 is a plurality of vertically installed on the swing frame 5 spaced apart in the front-rear direction of the upper swing body 3 (car body) as shown in FIG. It is supported from the lower side using 8 C, 8D of the supporters, and the connection beam 8E etc. which connected between these supporters 8C, 8D at the upper end side. That is, these struts 8C and 8D and the connecting beam 8E, etc., have a strong support structure even when the operator rides down the top cover 8B and the like during the maintenance (checking) time described later to form the top cover of the structure cover 8. It supports 8B from the lower side.

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 is used to check the engine 10 and the like described later from above as shown in FIG. It is opened and closed via the engine cover 14. And the opening part 9 is formed in the front side of the counter weight 7, and is formed as a substantially rectangular square hole extended in the front-back direction and the left-right direction of the top cover 8B.

In addition, the opening part 9 is arrange | positioned offset to the one side (position near left side when viewed from the rear of a vehicle body) with respect to the center position of the upper cover 8B, and the heat exchanger (of the engine 10 mentioned later) ( 11) and the cooling fan 12, etc., so that maintenance and inspection can be advantageously performed from above. And this opening part 9 is covered by the engine cover 14 mentioned later so that opening and closing is possible.

In this case, in the upper cover 8B of the structure cover 8, the site | part which becomes the periphery of the opening part 9 is reinforced by the said support | pillars 8C and 8D, the connection beam 8E, etc. That is, the strut 8C of the structure cover 8 is disposed at a position near the edge which becomes the front right side of the opening 9 when viewed from the rear of the upper swing structure 3 (car body), 8D is arrange | positioned in the vicinity of the edge used as the rear part right side of the opening part 9. As shown in FIG. The connecting beam 8E extends back and forth between the struts 8C and 8D so as to surround the right portion of the opening 9, and supports the upper cover 8B from the lower side at the right position of the opening 9 (reinforcement). )

Reference numeral 10 denotes an engine as a prime mover located near the counterweight 7 and installed on the rear side of the swing frame 5, the engine 10 having a structure cover 8, for example, as indicated by the dashed dashed line in FIG. ) It is accommodated in the state (machine room) in the horizontal arrangement, and extends inside the structure cover 8 to the left-right direction. Then, on one side of the engine 10, for example, a heat exchanger 11 made of a radiator, an oil cooler, a cooling fan 12, or the like is disposed, and on the other side of the engine 10 a plurality of hydraulic pumps (not shown). And the like).

Reference numeral 13 denotes an exhaust chimney protruding upward from the upper cover 8B of the structure cover 8, and the chimney 13 is connected to the exhaust side of the engine 10 and is discharged from the engine 10. Is emitted from above the upper cover 8B to the outside atmosphere.

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 portion 14A having an approximately rectangular shape, as shown in Figs. And the left plate portion 14B, the right plate portion 14C, and the cover plate portion 14A, which are located on both sides in the longitudinal direction (left and right directions) of the cover plate portion 14A, and are enlarged and opened in an inclined downward direction. ) A rectangular bottom is formed as a shallow cover body by the front plate part 14D and the rear plate part 14E which are located on both sides and are enlarged and opened inclined downwardly.

In this case, as for the left side plate part 14B located in the longitudinal direction one side of the engine cover 14, the lower side part uses the hinge 16 etc. which are mentioned later and the upper surface of the structure cover 8 (upper cover 8B). It is rotatably connected to. As a result, the engine cover 14 is opened and closed upward by using the hinge 16 as the rotational support point. At this time, the right side plate 14C on the other side in the longitudinal direction becomes a free end and undulates up and down as shown in FIG. (I) become

When the engine cover 14 is closed as shown in Figs. 2 and 3, the left plate portion 14B, the right plate portion 14C, the front plate portion 14D, and the like are described later on the upper surface of the upper cover 8B. It contacts with the sealing member 17 etc., and the back board part 14E contacts the upper plate 7A of the counterweight 7 via the sealing member 17, etc. As a result, the engine cover 14 in the door closed state prevents foreign matter 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 arrange | positioned offset to the left and right one side (position which becomes a left side view from the rear of a vehicle body) of the top cover 8B, in order to open and close the opening part 9 of the structure cover 8 here. . 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 an operator performing maintenance work or the like can easily open the engine cover 14 with the handle 18 described later. In addition, the cover plate part 14A of the engine cover 14 is formed so that the part of the middle part of the longitudinal direction (left-right direction) may form a stepped shape, and the height dimension of the engine cover 14 (cover plate part 14A) is the left side. The right side plate portion 14C is formed in a lower (smaller) dimension than the plate portion 14B.

Moreover, as shown in FIG. 5, the reinforcement boards 14F and 14G which reinforce between the cover plate part 14A, the front plate part 14D, and the rear plate part 14E are welded etc. to the inner side surface of the engine cover 14 as shown in FIG. The reinforcing plates 14F and 14G are fixed and installed by means of, for example, formed by bending a metal plate made of a thin steel sheet or the like into an L-shaped cross section.

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, for example, by bending a thin metal plate, as shown in FIG. It is formed, and is 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 connector 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 FIG. It is to configure the support point (center of rotation) when opening and closing.

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), the upper cover 8B located at the lower surface of the front plate portion 14D and the rear plate portion 14E and positioned around the opening 9, the upper plate 7A of the counterweight 7, and the engine cover ( 14) to seal between.

Further, the sealing member 17 is elastic between the upper plate 7A, the upper cover 8B and the lower surface side of the engine cover 14 of the counterweight 7 when the engine cover 14 is in the door closed state. It deforms and exhibits a vibration damping effect on the engine cover 14 in this state. That is, the sealing member 17 buffers the vibration transmitted from the engine 10 or the like from the upper cover 8B or the like of the structure cover 8 to the engine cover 14 to suppress the occurrence of vibration sounds or the like. will be.

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

Reference numeral 19 denotes a locking device for locking provided in the engine cover 14, and the locking device 19 is shown in FIGS. 2 and 3 when viewed from the rear of the vehicle body. It is provided in the corner side of 14 A of cover plate parts located in the front part right side. In addition, the lock device 19 is provided with a lock lever 19A extending toward the upper cover 8B side as shown in Fig. 5, and the lock lever 19A is centered on the support shaft 19B. Will be rotated.

That is, the lock device 19 is rotated about the support shaft 19B by inserting and turning a key (all not shown) in the key hole, and at this time, the lock lever 19A The tip end side is locked (locked) or unlocked on a lock plate (not shown) on the upper cover 8B side.

Reference numeral 20 denotes a door closing stopper employed in the present embodiment, and the door closing stopper 20 is a cover plate part located on the rear right side of the engine cover 14 when viewed from the rear of the vehicle body as shown in FIG. It is arrange | positioned at the corner side of 14A, and is provided in the position which becomes the opposite side to the lock apparatus 19 with the handle 18 in between. The door closing stopper 20 holds the engine cover 14 in the door closed state when the opening 9 of the structure cover 8 is closed by the engine cover 14. 21, the stopper member 27, etc. are comprised.

Reference numeral 21 denotes a stopper accommodating part which is fixed to the structure cover 8 side, and the stopper accommodating part 21 is a rear part of the opening 9 of the structure cover 8 as shown in Figs. It is arrange | positioned in the vicinity of the edge of the right side, and is engaged and separably fixed to the engagement hook part 27B of the stopper member 27 mentioned later according to the opening-closing operation of the engine cover 14. The stopper accommodating portion 21 is bent and formed as shown in Figs. 5 to 8 by using an elastically deformable metal plate (for example, spring steel, etc.), and the lower end (base end) side thereof is a supporting member described later. A fixing plate 21A (refer to FIG. 6) is detachably fixed to the 24 via the bolt 22 and the nut 23.

Moreover, as shown in FIG. 6, the stopper accommodating part 21 inclines the inclined board part 21B1 which bent upwards inclined toward the stopper member 27 side mentioned later from the upper end part of 21 A of fixed board parts, and the said inclined board part. It has the latching | fixing part 21B which consists of the guide plate part 21B2 formed by returning at substantially right angle from the upper end part (tip part) side of 21B1, The said latching part 21B has the inclination plate part 21B1 and the guide plate part 21B2. ) Is shaped to bend into a "ku" shape. Then, the locking fixing portion 21B of the stopper accommodating portion 21 is formed in a shape inclined and bent so that the inclined plate portion 21B1 is aligned with the engaging hook portion 27B of the stopper member 27, which will be described later. The locking hook 27B of the member 27 is separably fixed to the coupling hook 27B.

In this case, as shown in Fig. 6, the locking fixing portion 21B of the stopper accommodating portion 21 is fixed by the inclined plate portion 21B1 in the surface contact state with the engaging hook portion 27B of the stopper member 27. do. Further, the guide plate portion 21B2 of the locking portion 21B smoothly guides the engaging hook portion 27B of the stopper member 27 toward the inclined plate portion 21B1 when the engine cover 14 is closed by the door downward. In order to do this, it has the guide function which elastically deforms the latching | fixing part 21B of the stopper accommodating part 21 in the opposite direction to the engaging hook part 27B.

Reference numeral 24 denotes a support member for supporting the stopper accommodating portion 21 in a cantilevered state. The support member 24 is formed by using a metal plate such as an L-shaped steel, as shown in FIG. One side is fixed to the upper end side of the support 8D of the structure cover 8 using means, such as welding. And the support member 24 has a length dimension slightly larger than the width dimension of the stopper accommodating part 21 (fixed plate part 21A), and extends to the left-right direction along the front surface of the counterweight 7.

Moreover, the other side in the longitudinal direction of the supporting member 24 becomes a free end and is arrange | positioned in the vicinity of the edge located in the right side of the rear part of the said opening part 9, At this position, the fixing plate part 21A of the stopper accommodating part 21 is carried out. Is positioned via the bolt 22 and the nut 23. Thereby, as shown in FIG. 4, the stopper accommodating part 21 is arrange | positioned so that the latching | fixing part 21B side may protrude upward from the position near the edge used as the rear part right side of the opening part 9. As shown in FIG.

Reference numeral 25 is a plate-shaped bracket fixed to the engine cover 14, and the bracket 25 supports the stopper member 27 described later in a cantilevered state at a position facing the stopper receiving portion 21. . And the bracket 25 is formed in the shape which raises bending rigidity by bending a metal plate (for example, steel plate) in an inverted c shape in the width direction as shown in FIG. 8, and as shown in FIG. The inside of the engine cover 14 extends in the width direction (car body front-back direction) in a cantilever state. In addition, in FIG. 8, the engine cover 14 is abbreviate | omitted and shown in order to specify the shape of the bracket 25. As shown in FIG.

Here, the base end side of the bracket 25 is 25 A of joining board parts joined and overlapped with 14 G of reinforcement boards of the engine cover 14, as shown to FIG. 6, FIG. In addition, the front end side of the bracket 25 becomes the sheet board part 25B in which the stopper member 27 mentioned later is screwed through two nuts 26 and 26 (refer FIG. 8), for example, 25 C of rectangular stopper insertion holes are formed in the intermediate part of the board part 25B and the joining board part 25A.

In this case, the bracket 25 extends from the outer side in the width direction of the engine cover 14 toward the inner side, and the stopper accommodating portion is shown in Fig. 6 in the stopper insertion hole 25C of the bracket 25. The engaging fixing portion 21B of the 21 and the engaging hook portion 27B of the stopper member 27 are inserted with a gap. And the bracket 25 supports the stopper member 27 at the position facing the stopper accommodating portion 21, and supports the stopper member 27 in the width direction of the engine cover 14 rather than the stopper accommodating portion 21. It is arrange | positioned at the position which becomes inner side.

In the bracket 25, left and right bent portions 25D and 25D are formed at positions which become the left and right sides of the sheet plate portion 25B and the stopper insertion hole 25C, as shown in FIG. As shown in Fig. 6, the portion 25D is configured to move the locking portion 21B from the outside at this insertion position when the locking portion 21B of the stopper accommodation portion 21 is inserted into the stopper insertion hole 25C. At the same time, the locking fixing portion 21B of the stopper accommodating portion 21 compensates for maintaining a stable engagement with the engaging hook portion 27B of the stopper member 27.

Reference numeral 27 denotes a stopper member provided in the engine cover 14 via the bracket 25. The stopper member 27 is formed by bending a metal plate such as steel sheet, and the handle 18 as shown in FIG. It is arrange | positioned in the position (position which becomes the rear part side of a vehicle body) spaced apart from the position of the engine cover 14 in the width direction. 6 to 8, the stopper member 27 bends the fixing portion 27A located at its proximal end side and the distal end side of the fixing portion 27A in a substantially &quot; shi &quot; shape. It is comprised by the formed hook part 27B. Further, in the fixing portion 27A of the stopper member 27, bolt insertion through holes 27C and 27C made of long holes are formed as shown in FIG.

Then, the engaging hook portion 27B of the stopper member 27 bends in the opposite direction to the locking fixing portion 21B of the stopper accommodating portion 21, and as shown in Fig. 6, the stopper insertion hole of the bracket 25 is shown. The hook is fixed to fit the back of the stopper accommodating portion 21 to the catch fixing portion 21B within 25C. For this reason, when the stopper member 27 fixes the fixing portion 27A to the sheet plate portion 25B of the bracket 25, the engaging hook portion 27B is in the stopper insertion hole 25C of the bracket 25. It is provided on the front end side of the bracket 25 so that it may be inserted (inserted).

Reference numeral 28 denotes a bolt for fastening the stopper member 27 to the seat plate portion 25B of the bracket 25, and these bolts 28 penetrate each bolt insertion of the stopper member 27 as shown in FIG. 8. It is screwed to the nut 26 via the sheet plate part 25B of the bracket 25 in the state which penetrated into the hole 27C, and the base end side of the stopper member 27 is detached from the bracket 25 by this. It is possible to fix it.

Here, the fixing portion 27A of the stopper member 27 is in contact with the sheet plate portion 25B of the bracket 25 from the lower surface side, and the engaging hook portion 27B on the front end side inserts the stopper of the bracket 25. It is arrange | positioned so that it may incline upward from bottom from the hole 25C. And the installation position of the engaging claw part 27B in the stopper insertion hole 25C is position-adjusted in the longitudinal direction (car body front-back direction) of the bracket 25 by the bolt insertion hole 27C which consists of a long hole. As a result, the stopper member 27 (coupling hook portion 27B) can be positioned at a stable locking (combination) position with respect to the stopper accommodating portion 21 (locking fixing portion 21B).

In this way, the door closing stopper 20 covers the engine hook by locking the engaging hook portion 27B of the stopper member 27 to the locking fixing portion 21B of the stopper accommodating portion 21 from the rear side in an elastically deformed state. It is to hold | maintain 14 in the door closed state. And when opening the engine cover 14 from such a door closed state, the stopper member 27 with respect to the stopper accommodating part 21 is utilized using what the engine cover 14 elastically bends and deforms so that it may mention later. ) Is to release the locked state (combined state) of the.

Reference numeral 29 denotes a stay as a door opening holding means for holding the engine cover 14 in the door opening position. The stay 29 is in a state in which the engine cover 14 is greatly opened as shown in FIG. It is holding. The stay 29 holds the engine cover 14 in the door open state to prevent the engine cover 14 from being unnecessarily closed during the maintenance work described later.

Next, reference numeral 30 denotes an operating oil tank located on the right front side of the structure cover 8 and installed on the swing frame 5, as shown in FIG. While returning to the suction side, the return oil from the hydraulic actuator (not shown) is refluxed. In addition, a fuel tank 31 or the like for supplying fuel to the engine 10 is provided on the front side of the working oil tank 30.

The hydraulic excavator 1 according to the present embodiment has the configuration as described above, and the operation thereof will be described next.

First, when the operator who climbs into the cap 6 of the hydraulic excavator 1 starts the engine 10 in the structure cover 8 by operating a start switch, the hydraulic pump and the like are driven by the engine 10. . Then, the operator properly tilts the operation lever or the like in the cap 6 so that the hydraulic oil from the hydraulic pump travels the hydraulic cylinders of the work device 4, the turning hydraulic motor, or the lower traveling body 2. It is supplied to hydraulic oil motors (all of which are not shown) etc., and excavation work of earth-eating etc. is performed.

In addition, when performing maintenance and inspection (maintenance work) of the engine 10, the heat exchanger 11, the cooling fan 12, etc. installed in the structure cover 8, the upper cover 8B of the structure cover 8 is performed. The operator who lifted on the engine cover 14 lifts the engine cover 14 and the hinge 16 by rotating it by holding the handle 18 of the engine cover 14 with one hand and lifting it upward (in the direction of arrow A in FIG. 5). Can be opened upward, and the door opening operation of the engine cover 14 can be performed by using only one hand.

That is, when opening the engine cover 14 held in the door closed state, for example, an operator of the hydraulic excavator 1 grasps the handle 18 of the engine cover 14 with one hand and moves upward ( When lifting in the direction of arrow A in Fig. 5, the cover plate portion 14A of the engine cover 14 is bent in a convex curve as shown by the dashed-dotted line in Fig. 5 by the lifting force at this time, whereby the engine cover ( The front plate portion 14D and the rear plate portion 14E of 14 are elastically bent and deformed in the directions of arrows B and B in FIG.

In the bracket 25 provided on the rear plate portion 14E side of the engine cover 14 via the reinforcing plate 14G, the rear plate portion 14E is bent and deformed in the arrow B direction in FIGS. 5 and 6. The pressure is moved toward the width direction inner side of the engine cover 14 in the arrow C direction. As a result, the bracket 25 moves the engaging hook portion 27B of the stopper member 27 relatively in the direction away from the engaging fixing portion 21B (inclined plate portion 21B1) of the stopper accommodating portion 21. Can be.

In this way, the stopper member 27 is moved by moving the stopper member 27 of the door closing stopper 20 in the direction away from the locking fixing portion 21B of the stopper accommodating portion 21 by using the bending deformation of the engine cover 14. ), The engaging hook portion 27B is forcibly released from the stopper accommodating portion 21 as illustrated in FIG.

For this reason, the operator etc. of the hydraulic excavator 1 hold | maintain the grip 18 of the engine cover 14, for example, and the door is closed only by lifting the engine cover 14 to a door opening direction (upward). The locking state of the stopper 20 can be released, and in this state, the engine cover 14 is operated by one hand only to the door opening position shown in FIG. 4 by only lifting the engine cover 14 upward. I can move simply.

And in this door open position, the engine cover 14 can be hold | maintained in the state opened large by the stay 29 etc. Thereby, maintenance and inspection work of the engine 10, the heat exchanger 11, the cooling fan 12, etc. which were installed in the structure cover 8 can be performed reliably from the upper side of the opening part 9. As shown in FIG.

On the other hand, when closing the opening 9 of the structure cover 8 with the engine cover 14, for example, pressing the handle 18 downward while rotating the engine cover 14 about the hinge 16. It is possible to fix the stopper member 27 of the door closing stopper 20 to the locking fixing portion 21B of the stopper accommodating portion 21 in the back alignment state as shown in Figs. The engine cover 14 can be simply held in the door closed state.

That is, the guide plate part 21B2 of the stopper accommodating part 21, when the engine cover 14 is closed by the door downward, comes in contact with the tip end side of the engaging claw part 27B, and the locking plate 21B is attached. Elastically deforms in the opposite direction to the engaging hook portion 27B, whereby the engaging hook portion 27B of the stopper member 27 can be guided smoothly to the inclined plate portion 21B1 side, and the engine cover 14 is closed in the door. I can simply hold it.

Thus, according to this embodiment, the door closing stopper 20 which holds the engine cover 14 in the door closed state is fixed to the support 8D of the structure cover 8 via the support member 24 etc. The door closing stopper 20 has a simple structure because it is constituted by the stopper housing 21 and the stopper member 27 provided on the reinforcement plate 14G of the engine cover 14 via the bracket 25. The cost of the door closing stopper 20 can be reduced, and the workability at the time of assembly attachment can also be improved.

In addition, when closing the engine cover 14 from the door open state, for example, the stopper member 27 of the door closing stopper 20 is simply pushed in by pressing the handle 18 of the engine cover 14 downward. The latch fixing portion 21B of the stopper accommodating portion 21 can be locked in an elastic deformation state, and the engine cover 14 can be simply held in the door closed state.

Then, when opening the engine cover 14 held in the door closed state by the door closing stopper 20, the operator, for example, moves the handle 18 of the engine cover 14 in the door opening direction. Lifting and elastically bending deformation of the whole engine cover 14 by this lifting force (external force), the stopper member 27 of the door closing stopper 20 is used by this bending deformation, the stopper accommodating part 21 Can move in the direction away from the locking fixing portion 21B, thereby forcibly releasing the locking state of the stopper member 27 with respect to the stopper receiving portion 21.

Therefore, the operator who climbs on the upper cover 8B of the structure cover 8 to approach the position of the door closing stopper 20 close to the counterweight 7 to perform maintenance and inspection of the engine 10 or the like. There is no need, and the engine cover 14 can be easily opened and closed by operating with only one hand, and the burden of an operator can be greatly reduced compared with the prior art which used the catch etc., for example.

That is, for example, when an operator opens and closes the engine cover 14, the engine cover (only by holding the handle 18 from the position which becomes the front side of the vehicle body (upper cover 8B) rather than the engine cover 14) The door 14 can be opened or closed, and the opening and closing operation of the engine cover 14 can be performed without moving the upper cover 8B on the rear side of the vehicle body (for example, the position of the counterweight 7). Can be.

As a result, the operator can perform the opening and closing operation of the engine cover 14 from a large space position on the structure cover 8 in peace, and can reduce the burden on the operator and reliably improve workability, safety, and the like. Can be. And maintenance and inspection (maintenance work) of the engine 10 etc. which were accommodated in the structure cover 8 can be performed stably, and the workability at the time of maintenance can also be improved.

In addition, the stopper accommodating portion 21 and the stopper member 27 of the door closing stopper 20 are structured to be received between the opening 9 of the structure cover 8 and the engine cover 14, and thus are used in the prior art. Durability, lifespan, etc. as the door closing stopper 20 can be reliably extended, without being exposed to external dust or rainwater, such as a catch.

In addition, the height dimension of the engine cover 14 (cover plate portion 14A) is smaller than that of the left plate portion 14B on which the hinge 16 is installed, and the height dimension of the right plate portion 14C on which the handle 18 is provided is smaller. In this way, the rear view from the cap 6 (cab) can be secured widely.

In addition, in the said embodiment, the case where the latching | fixing part 21B of the stopper accommodating part 21 was formed in the shape bent in a "cu" shape was demonstrated as an example. However, the present invention is not limited to this, and may be formed by bending the locking portion of the stopper accommodating portion, for example, in a "V" shape or a "U" shape, that is, the handle 18 of the engine cover 14 is formed. What is necessary is just a structure which can release the latching | locking state of the stopper member with respect to a stopper accommodating part using the bending deformation of the engine cover 14 when lifting up from the door closed state.

In addition, in the said embodiment, when installing the door closing stopper 20 in the width direction one side of the engine cover 14 (for example, the position which becomes the rear part right side of the opening part 9 when viewed from the rear of a vehicle body). For example, explained. However, this invention is not limited to this, For example, in the front-back position (width side both sides of the engine cover 14) which becomes the right side of the opening part 9, for example when the door closing stopper 20 is seen from the rear of a vehicle body, respectively. It is good also as a structure to install.

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 used before and behind a vehicle.

In addition, the said embodiment demonstrated the hydraulic excavator as an example as a working machine. However, the present invention is not limited thereto, and for example, a variety of configurations in which the inspection openings provided on the upper part of the structure cover, such as a hydraulic crane, a wheel loader, a forklift, a construction machine, and the like, can be opened and closed by the engine cover. It is widely applicable to working machines.

As described above, according to the invention described in claim 1, the door closing stopper is composed of a stopper accommodating portion provided on the structure cover side and a stopper member provided on the engine cover side, and thus the door closing stopper can be configured with a simple structure. It is possible to reduce the cost as the door closing stopper and to improve the workability at the time of assembling. In addition, when closing the engine cover from the door open state, for example, the stopper member of the door closing stopper can be engaged with the stopper accommodating portion by simply pressing the engine cover downward, and the engine cover is brought into the door closed state. I can easily hold it. And when opening the engine cover hold | maintained in the door closed state by such a door closing stopper, for example, when an operator adds external force so that an engine cover may be lifted to a door opening direction, this lifting force (external force) By flexurally deforming the entire engine cover, the bending deformation can be used to move the stopper member of the door closing stopper away from the stopper receiving portion, thereby engaging the stopper member with the stopper receiving portion. Can be forcibly released.

Thus, for example, the operator of the work machine can release the door closing stopper by simply lifting the engine cover in the door opening direction while holding the handle of the engine cover or the like, and in this state, It can be moved to the door open position only by lifting upward. Therefore, the operator does not need to approach the position of the door closing stopper, and can easily operate the door by operating the engine cover by using only one hand, and greatly reduces the burden on the operator as compared to the prior art using catch or the like. You can. In addition, by employing the door closing stopper having a simple structure as described above, it is possible to reduce the height dimension of the engine cover, for example, to secure a wide rear view from the cab.

The invention according to claim 2 is provided with a hinge on one side in the longitudinal direction of the engine cover, a handle at a middle position in the width direction on the other side in the longitudinal direction, and a stopper accommodating portion of the door closing stopper is spaced apart from the handle than the stopper member. Since it is arranged to be positioned at the position which becomes the width direction outer side of the engine cover in the closed position, for example, when the operator of the working machine or the like grips the handle strongly to open the engine cover and lifts it upwards, the lifting force By the external force, the entire engine cover is elastically deformed so as to bend convexly curved about the position of the handle, and the stopper member provided on the engine cover side moves toward the handle in the width direction of the engine cover. Is displaced. Thereby, the stopper member of the door closing stopper can be moved in the direction away from the latch fixing part of the stopper accommodating portion, and the engagement state of the stopper member with respect to the stopper accommodating portion can be released by using the bending deformation of the engine cover.

In addition, according to the invention of claim 3, the stopper accommodating portion has a catch fixing portion which is bent from a position which becomes the rear side of the vehicle body and protrudes upward from the opening of the structure cover, and the stopper member is different from the catch fixing portion of the stopper accommodating portion. Since it is the structure which has the engaging hook part bent in the reverse direction, both can be combined so that coupling | bonding and detachment is possible in the back side so that the engaging hook part of the stopper member may be aligned with the latch fixing part of the stopper accommodating part. For example, when the operator opens and closes the engine cover, the engine cover can be opened or closed by simply grasping the handle from the position that becomes the front side of the vehicle body rather than the engine cover. For example, the opening and closing operation of the engine cover can be performed without moving on the structure cover up to the position of the counter weight. Therefore, the operator can safely open and close the engine cover from a large space position on the structure cover, can reduce the burden on the operator, and can reliably improve workability, safety, and the like.

Further, according to the invention of claim 4, a stopper insertion hole is formed in the bracket extending inward from the width direction outer side of the engine cover, and the stopper is inserted into the stopper insertion hole at the distal end side of the bracket. Since the member is provided and the stopper receiving portion of the stopper accommodating portion is configured to be inserted into the stopper insertion hole of the plastic bracket when the door is closed, the joining hook portion of the stopper member is used. Thus, the stopper member of the door closing stopper can be disposed at a position that is inside the width direction of the engine cover than the stopper accommodating portion, and the engaging hook portion of the stopper member is engaged with the stopper fixing portion of the stopper accommodating position at the position that becomes the width direction inner side. It can be detachably locked. And, when the operator lifts the engine cover in the door opening direction and flexibly deforms the entire engine cover, the bending deformation can be used to move the engaging hook portion of the stopper member in a direction away from the locking fixing portion of the stopper receiving portion. As a result, the engagement state (locking state) of the stopper member to the stopper accommodation portion can be released.

Claims (4)

A frame of a vehicle body on which a work device is installed, an engine mounted on the frame, a structure cover that surrounds the engine from the outside and is vertically installed on the frame to provide an opening on an upper side thereof, and to cover the opening of the structure cover; An engine cover provided on a structure cover to be opened and closed and a door closing stopper for holding the engine cover in a door closed state when the opening of the structure cover is closed by the engine cover. The door closing stopper is composed of a stopper receiving portion fixedly installed on the structure cover side to be elastically deformable, and a stopper member fixedly installed on the engine cover to be detachably coupled to the stopper receiving portion, The stopper member is configured to release the engaged state to the stopper accommodating portion by using the engine cover elastically bent and deformed by an external force when the engine cover is lifted in the door opening direction from the door closed state. Characterized by working machine. The said engine cover is provided with the hinge which becomes a rotation support point at the time of opening and closing an engine cover on the said structure cover in one side of a longitudinal direction, and the other side of the engine cover is gripped at the time of opening and closing an operation of the said engine cover. The handle is disposed at an intermediate position in the width direction, and the stopper member of the door closing stopper is disposed at a position spaced apart from the handle in the width direction of the engine cover, and the stopper accommodating portion is in the widthwise outer side of the engine cover than the stopper member. The working machine which consists of a structure arrange | positioned at the position to become. The said stopper accommodating part is a structure which has the latching | locking part which bends and protrudes upwards from the position which becomes the rear part side of the said vehicle body among the openings of the said structure cover, The said stopper member is a said stopper, And a coupling hook portion that bends in a reverse direction with a locking portion of the accommodation portion to engage and detachably engage the locking portion. The said engine cover is provided with the bracket in which the stopper insertion hole extended inward from the width direction outer side of the said engine cover is provided, and the said engaging hook part is inserted in the said stopper insertion hole in the front end side of the said bracket. The stopper member is provided so as to be inserted, and the stopper part of the stopper accommodating part is inserted into the stopper insertion hole of the bracket when the door is closed to the engine cover to engage the engaging hook part of the stopper member. .

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