JP2007100351A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine which enables an engine cover to be easily operated for opening/closing with only one hand by simplifying a structure of a cover-closing stopper, and which can reduce a burden on an operator. <P>SOLUTION: The cover-closing stopper 20 for keeping the engine cover 14 in a closed state comprises a stopper retainer 21 which is fixed to a support 8D of a building cover 8 via a supporting member 24 etc., and a stopper member 27 which is provided on the reinforcing plate 14G of the engine cover 14 via a bracket 25. When the engine cover 14 is put into an opened state from a closed state, the whole of the engine cover 14 is deflection-deformed by an external force for lifting the handle 18 of the engine cover 14 in a cover opening direction. The utilization of the deflection deformation of the engine cover 14 makes the stopper member 27 of the cover-closing stopper 20 shifted in the direction of being separated from a latching part 21B of the stopper retainer 21, so that they can be unlatched from each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a work machine suitably used as a construction machine or a transport machine such as a hydraulic excavator, a crane, a wheel loader, or a forklift, and more particularly to a work machine provided with a building cover that houses a power source such as an engine.

  In general, a working machine (construction machine) such as a hydraulic excavator has a structure in which a building cover is provided on a frame of a vehicle body, and a machine room in which a power source such as an engine is accommodated by the building cover. . In addition, an opening for inspection is provided in the upper part of the building cover in order to maintain and inspect the engine in the machine room, and the opening is covered with an engine cover (bonnet) so as to be opened and closed (for example, Patent Documents). 1).

  Further, in order to hold the engine cover in a closed state (closed state) between the engine cover and the building cover, for example, a closing stopper made of a fixture called a catch is provided. The fixture called the catch is configured using a gripper, a hook, a locking shaft, and the like, and is provided on the engine cover side by rotating the hook with the gripper provided on the building cover side. A hook is hooked on the locking shaft to fix the engine cover in a closed state.

JP 2001-323507 A

  By the way, since the work machine according to the above-described prior art is configured to hold the engine cover in a closed state using a so-called catch (a closing stopper), the engine cover is opened and closed every time. Every time the operator needs to rotate the catch with a fingertip or the like, there is a problem in that extra time is required and the burden on the operator increases.

  In this case, before lifting and opening the engine cover in the closed state, the operator of the work machine rotates the catch in a direction to remove it from the engine cover, for example, with a fingertip, so that the engine cover is locked by the catch. To release. Thereafter, the operator is required to perform an operation of changing the posture so as to turn toward the handle side of the engine cover and lifting the engine cover in the door opening direction while firmly holding the handle in this state.

  For this reason, since the engine cover is opened from the closed state to the door, the operator is required to perform complicated work (operation) to change the work posture appropriately while using both hands, thereby reducing the burden on the operator. It is something that cannot be done.

  Moreover, in construction machines such as hydraulic excavators, the top surface of the building cover is located at a height of 2 to 3 m (meters) or more from the ground. Therefore, when the operator opens and closes the engine cover on the building cover, It is necessary to approach through the narrow scaffold to the position of the catch, and the operator must pay enough attention not to accidentally fall from the high position on the building cover, which also increases the burden on the operator There is a problem of doing.

  In addition, since the catch as a closing stopper used in the prior art is constituted by using a large number of parts such as hooks and locking shafts as described above, it has a complicated structure and the unit price per catch increases. In addition, there is a problem that workability when the catch is assembled between the engine cover and the building cover is poor.

  Furthermore, since the catch used in the prior art is attached in the height direction of the engine cover, the height of the engine cover needs to be formed larger than the overall length of the catch. However, when the height dimension of the engine cover is increased, the rear view from the cab is blocked by this, and there is a problem that a wide view cannot be secured.

  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 be able to easily open the engine cover with only one hand operation and to surely reduce the burden on the operator. Is to provide a working machine.

  Another object of the present invention is to improve the workability when assembling the door stopper with a simple structure and to reduce the height of the engine cover. An object of the present invention is to provide a work machine that can ensure a wide field of view.

  In order to solve the above-described problems, the present invention is directed to a vehicle body frame provided with a working device, an engine mounted on the frame, and an upper portion that is erected on the frame and surrounds the engine from the outside. A building cover provided with an opening on the side, an engine cover provided on the building cover so as to be openable and closable so as to cover the opening of the building cover, and the opening of the building cover closed by the engine cover It is sometimes applied to a work machine provided with a closing stopper that holds the engine cover in a closed state.

  A feature of the configuration adopted by the invention of claim 1 is that the door stopper is fixed to the building cover side and is provided to be fixed to the engine cover and a stopper receiver that is elastically deformable. The stopper member is detachably engaged with the stopper receiver, and the stopper member is elastically bent by an external force when the engine cover is lifted from the closed state to the door opening direction. There is a configuration in which the engagement state with respect to the stopper receiver is released by utilizing the deformation.

  According to a second aspect of the present invention, the engine cover is provided with a hinge that serves as a pivot for opening and closing the engine cover on the building cover on one side in the length direction. On the other side, a handle that is gripped when the engine cover is opened and closed is provided at an intermediate position in the width direction, and the stopper member of the door stopper is located at a position spaced from the handle in the width direction of the engine cover. The stopper receiver is arranged at a position on the outer side in the width direction of the engine cover with respect to the stopper member.

  According to a third aspect of the present invention, the stopper receiver has a latching portion that is bent from a position on the rear side of the vehicle body in the opening of the building cover and protrudes upward, and the stopper member Is configured to have an engaging claw portion that is bent in a direction opposite to the latching portion of the stopper receiver and is detachably engaged with the latching portion.

  According to a fourth aspect of the present invention, the engine cover is provided with a bracket formed with a stopper insertion hole extending from the outer side in the width direction of the engine cover to the inner side, The stopper member is provided so that the mating portion fits into the stopper insertion hole, and the latching portion of the stopper receiver is inserted into the stopper insertion hole of the bracket when the engine cover is closed. It is set as the structure engaged with an engaging claw part.

  As described above, according to the first aspect of the present invention, since the door closing stopper is constituted by the stopper receiver provided on the building cover side and the stopper member provided on the engine cover side, the door closing stopper has a simple structure. Thus, the cost of the door closing stopper can be reduced, and the workability during assembly can be improved. When the engine cover is closed from the open state, the stopper member of the door stopper can be engaged with the stopper receiver simply by pushing the engine cover downward, and the engine cover can be easily held in the closed state. can do. When opening the engine cover held in the closed state by such a door stopper, for example, when the operator applies an external force to lift the engine cover in the door opening direction, the engine cover is applied by this lifting force (external force). By elastically bending and deforming the whole, it is possible to move the stopper member of the closing stopper away from the stopper receiver using this bending deformation, and thereby the engagement state of the stopper member with respect to the stopper receiver can be changed. It can be forcibly released.

  For this reason, for example, the operator of the work machine can release the engagement state of the closing stopper simply by lifting the engine cover in the direction of opening the door while holding the handle of the engine cover, and just lifting the engine cover upward Can be moved to the open position. Therefore, it is not necessary for the operator to approach the position of the closing stopper, and the engine cover can be easily opened with only one hand, which greatly reduces the burden on the operator compared to conventional techniques using catches. Can be reduced. Moreover, by adopting the door stopper with a simple structure as described above, the height of the engine cover can be reduced, and for example, a wide rear view from the cab can be secured.

  In the invention according to claim 2, the hinge is provided on one side in the length direction of the engine cover, the handle is provided at the intermediate position in the width direction on the other side in the length direction, and the stopper receiver of the closing stopper is a stopper member. In order to open the engine cover, for example, an operator of the work machine holds the handle strongly upward so that the engine cover is arranged at a position farther away from the handle and outside the engine cover in the width direction. When lifted, the lifting force (external force) causes the entire engine cover to be elastically deformed so that it bends in a convex curve centered on the handle, and the stopper member provided on the engine cover side moves inward in the width direction of the engine cover. It will be displaced in the direction approaching the handle. As a result, the stopper member of the door stopper can be moved away from the latching portion of the stopper receiver, and the engagement state of the stopper member with respect to the stopper receiver can be released using the bending deformation of the engine cover.

  Further, according to the invention described in claim 3, the stopper receiver has a latching portion that bends and projects upward from a position on the rear side of the vehicle body in the opening of the building cover, Since the engaging claw portion is bent in the opposite direction to the latching portion of the stopper receiver, both the engagement claw portion of the stopper member are back-to-back with the latching portion of the stopper receiver. It is possible to engage with the back side in a detachable manner. For example, when the operator opens and closes the engine cover, the engine cover can be opened or closed simply by grasping the handle from a position on the front side of the vehicle body with respect to the engine cover. The engine cover can be opened and closed without moving on the building cover to the position of the counterweight. For this reason, the operator can open and close the engine cover from a wide space position on the building cover with peace of mind, which can reduce the burden on the operator and improve workability, safety, etc. reliably. it can.

  According to a fourth aspect of the present invention, the stopper insertion hole is formed in the bracket extending inwardly from the outer side in the width direction of the engine cover, and the engaging claw portion is provided at the distal end side of the bracket. A stopper member is provided so as to be fitted into the hole, and the stopper receiving portion is inserted into the stopper insertion hole of the bracket when the engine cover is closed to engage with the engaging claw portion of the stopper member. Therefore, using the bracket, the stopper member of the door closing stopper can be disposed at a position on the inner side in the width direction of the engine cover with respect to the stopper receiver, and the engaging claw portion of the stopper member at the position on the inner side in the width direction. It is possible to detachably engage with the suspending portion. Then, when the operator lifts the engine cover in the door opening direction and elastically bends and deforms the entire engine cover, the direction in which the engaging claw portion of the stopper member is separated from the latching portion of the stopper receiver using this bending deformation. By this, the engagement state (hanging state) of the stopper member with respect to the stopper receiver can be released.

  Hereinafter, a case where the working machine according to the embodiment of the present invention is applied to a hydraulic excavator will be described as an example and described in detail with reference to the accompanying drawings.

  Here, FIG. 1 to FIG. 8 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a work machine. The hydraulic excavator 1 is mounted on a crawler type lower traveling body 2 capable of self-propelling as shown in FIG. The upper revolving unit 3 and a work device 4 provided so as to be able to move up and down in front of the upper revolving unit 3 for excavation work such as earth and sand are roughly constituted.

  In this case, the upper swing body 3 of the hydraulic excavator 1 constitutes the vehicle body of the work machine together with the lower traveling body 2. The upper swing body 3 includes a swing frame 5, a cab 6, a counterweight 7, a building cover 8, an engine 10, an engine cover 14, and the like which will be described later. Further, the vehicle width of the upper swing body 3 is set to a dimension W shown in FIG. 2, and a building cover 8 to be described later is formed in a small and compact size within the range of the dimension W.

  Reference numeral 5 denotes a revolving frame constituting a support structure (frame) for the upper revolving structure 3. The revolving frame 5 is attached to the front side thereof so that the working device 4 can move up and down, and a counterweight 7 described later is provided on the rear side. Installed.

  Reference numeral 6 denotes a cab serving as a riding section for an operator disposed on the left side of the front part of the revolving frame 5. The cab 6 defines a driver's cab in the driver's seat, an operating lever, and an operating pedal. (Both not shown) and the like are arranged.

  Reference numeral 7 denotes a counterweight provided on the rear end side of the revolving frame 5. The counterweight 7 is detachably mounted on the rear end side of the revolving frame 5, and the entire upper revolving unit 3 is attached to the front working device 4. The weight balance is taken. A building cover 8 that houses an engine 10 and the like to be described later is provided on the front side of the counterweight 7.

  Here, an upper plate 7A is fixedly provided on the upper surface side of the counterweight 7 as shown in FIGS. 3 to 6, and this upper plate 7A constitutes a part of the counterweight 7, The upper surface is arranged on 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 upper cover 8B when the engine cover 14 described later is closed.

  Reference numeral 8 denotes a building cover which is positioned between the cab 6 and the counterweight 7 and is erected on the revolving frame 5. The building cover 8 includes a plurality of sheets of steel plates or the like as shown in FIGS. 1 to 4. It is formed using a metal panel and defines a machine room inside. The building cover 8 includes side covers 8A and 8A provided 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.

  Here, as shown in FIG. 5, the upper cover 8B of the building cover 8 is separated from the front and rear of the upper swing body 3 (vehicle body) in a plurality of columns 8C and 8D which are erected upward on the swing frame 5. And a supporting beam 8E that connects these support columns 8C and 8D on the upper end side. That is, the support columns 8C and 8D, the connecting beam 8E, and the like form a sturdy support structure even when the operator gets on and off the upper cover 8B during maintenance (inspection) described later, and thus the upper cover 8B of the building cover 8 is formed. Is supported from below.

  Reference numeral 9 denotes an opening serving as an inspection port provided in the upper cover 8B of the building cover 8. The opening 9 is used to check the engine cover 14 when inspecting the engine 10 and the like described later from above as shown in FIG. It is opened and closed. The opening 9 is formed as a substantially square hole that is located on the front side of the counterweight 7 and extends in the front, rear, left, and right directions of the upper cover 8B.

  The opening 9 is disposed offset to the left and right sides of the upper cover 8B in the left and right directions (a position closer to the left side as viewed from the rear of the vehicle body). It is formed so that maintenance and inspection of the vessel 11 and the cooling fan 12 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 from an upper side.

  In this case, the upper cover 8B of the building cover 8 has a portion around the opening 9 reinforced by the columns 8C and 8D, the connecting beam 8E, and the like. That is, the column 8C of the building cover 8 is disposed in the vicinity of the corner that is the right side of the front of the opening 9 when viewed from the rear of the upper swing body 3 (vehicle body). It is arranged in the vicinity of the corner. The connecting beam 8E extends forward and backward between the columns 8C and 8D so as to border the right side portion of the opening 9, and supports (reinforces) the upper cover 8B from the lower side at the right position of the opening 9. It is.

  Reference numeral 10 denotes an engine as a prime mover located near the counterweight 7 and provided on the rear side of the revolving frame 5. The engine 10 is installed in the building cover 8 (machine room, for example, as shown by a two-dot chain line in FIG. 2). ) In a horizontally placed state and extends left and right in the building cover 8. A heat exchanger 11 including a radiator, an oil cooler, and the like, and a cooling fan 12 are disposed on one side of the engine 10, and a plurality of hydraulic pumps (not shown) are disposed on the other side of the engine 10. ) Etc. are arranged.

  Reference numeral 13 denotes an exhaust chimney that protrudes upward from the upper cover 8B of the building cover 8. The chimney 13 is connected to the exhaust side of the engine 10, and exhaust gas discharged from the engine 10 is exhausted from the upper cover 8B. It is discharged from above into the outside atmosphere.

  Reference numeral 14 denotes an engine cover for opening and closing the opening 9 of the building cover 8. The engine cover 14 includes an upper cover plate portion 14A having a substantially rectangular shape and the cover plate portion as shown in FIGS. 14A is located on both sides of the length direction (left and right directions) and extends leftwardly and downwardly on the left and right side plates 14B and 14C, and on both sides in the width direction (front and rear) of the lid plate portion 14A. The front plate portion 14D and the rear plate portion 14E that are positioned and extend obliquely downward are formed as a shallow cover body having a quadrangular shape.

  In this case, the left side plate portion 14B located on one side in the length direction of the engine cover 14 is rotatably connected to the upper surface of the building cover 8 (upper cover 8B) using a hinge 16 or the like described later. Has been. As a result, the engine cover 14 is opened and closed upward with the hinge 16 as a pivot, and at this time, the right side plate portion 14C on the other side in the longitudinal direction becomes a free end and undulates upward and downward as shown in FIG. Is done.

  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 plate portion 14D and the like are placed on the upper surface of the upper cover 8B via a seal member 17 which will be described later. The rear plate portion 14E comes into contact with the upper plate 7A of the counterweight 7 via the seal member 17 or the like. Thereby, the engine cover 14 in the closed state prevents foreign matters such as rainwater and dust from entering the building cover 8 from the opening 9 of the upper cover 8B.

  Here, the engine cover 14 is disposed offset to the left and right sides of the upper cover 8B (position on the left side when viewed from the rear of the vehicle body) in order to open and close the opening 9 of the building cover 8. ing. The length of the engine cover 14 (the dimensions in the left and right directions) is, for example, smaller than about 1/3 to 1/2 of the vehicle width (dimension W) in FIG.

  Thus, the weight of the engine cover 14 is reduced, and an operator who performs maintenance work or the like can easily open the engine cover 14 by holding a handle 18 described later. Further, the cover plate portion 14A of the engine cover 14 is formed such that a middle portion in the length direction (left and right directions) forms a stepped shape, and the height dimension of the engine cover 14 (cover plate portion 14A) is The right side plate portion 14C is formed to have a lower (smaller) size than the left side plate portion 14B.

  Further, as shown in FIG. 5, reinforcing plates 14F and 14G for reinforcing the space between the cover plate portion 14A, the front plate portion 14D, and the rear plate portion 14E are fixed to the inner side surface of the engine cover 14 by means such as welding. These reinforcing plates 14F and 14G are formed by bending a metal plate made of, for example, a thin steel plate or the like into an L-shaped cross section.

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

  Reference numerals 16 and 16 denote hinges for connecting the engine cover 14 to the upper cover 8B of the building cover 8 so as to be openable and closable, and these hinges 16 are constituted by, for example, a connector made of a hinge or the like. As shown in FIG. 4, the hinge 16 is rotatably mounted between the upper cover 8B of the building cover 8 and the mounting plate 15 of the engine cover 14, and a fulcrum (when the engine cover 14 is opened and closed) (Center of rotation).

  Reference numeral 17 denotes a seal member provided on the lower surface side of the engine cover 14, and the seal member 17 includes the entire lower surface of the engine cover 14 (the left side plate portion 14B, the right side plate portion 14C, the front plate portion 14D, and the It is attached to the lower surface of the rear plate portion 14E, and seals between the upper cover 8B and the upper plate 7A of the counterweight 7 and the engine cover 14 located around the opening 9.

  The seal member 17 is elastically deformed between the upper plate 7A and the upper cover 8B of the counterweight 7 and the lower surface side of the engine cover 14 when the engine cover 14 is closed. 14 exerts a vibration buffering effect on 14. That is, the vibration transmitted from the engine 10 or the like is transmitted to the engine cover 14 from the upper cover 8B or the like of the building cover 8 by the seal member 17 to suppress the generation of vibration noise or the like.

  Reference numeral 18 denotes a handle fixed to the cover plate portion 14A of the engine cover 14. The handle 18 has a width close to the right plate portion 14C of the engine cover 14 as shown in FIGS. It is attached to the middle part in the direction (the middle position in the front and rear directions). An operator who performs maintenance work or the like performs a door opening operation by lifting the engine cover 14 with the hinge 16 as a rotation fulcrum while holding the handle 18 with one hand.

  Reference numeral 19 denotes a locking device for a lock provided on the engine cover 14, and the locking device 19 is a lid plate portion located on the right side of the front portion of the engine cover 14 when viewed from the rear of the vehicle body as shown in FIGS. It is provided on the corner corner side of 14A. Further, the lock device 19 is provided with a lock lever 19A extending toward the upper cover 8B as shown in FIG. 5, and the lock lever 19A is rotated around the support shaft 19B.

  That is, the lock device 19 is rotated around the support shaft 19B by inserting a key (none of which is shown) into the keyhole and turning, and at this time, the distal end side of the lock lever 19A is moved. It is locked (locked) or unlocked by a lock plate (not shown) on the upper cover 8B side.

  Reference numeral 20 denotes a closing stopper employed in the present embodiment, and the closing stopper 20 is arranged on the corner corner side of the lid plate portion 14A located on the right side of the rear portion of the engine cover 14 as viewed from the rear of the vehicle body as shown in FIG. The grip 18 is provided at a position opposite to the lock device 19. The door closing stopper 20 holds the engine cover 14 in a closed state when the opening 9 of the building cover 8 is closed by the engine cover 14, and is constituted by a stopper receiver 21, a stopper member 27 and the like which will be described later. Yes.

  Reference numeral 21 denotes a stopper receiver fixedly provided on the building cover 8 side. The stopper receiver 21 is disposed in the vicinity of the right corner of the rear portion of the opening 9 of the building cover 8 as shown in FIGS. In accordance with the opening / closing operation of the engine cover 14, it is engaged with an engaging claw portion 27B of a stopper member 27, which will be described later, in a detachable manner. The stopper receiver 21 is formed by bending as shown in FIGS. 5 to 8 using an elastically deformable metal plate (for example, spring steel or the like), and its lower end (base end) side is a support described later. A fixing plate portion 21A (see FIG. 6) is detachably fixed to the member 24 via bolts 22 and nuts 23.

  Further, as shown in FIG. 6, the stopper receiver 21 includes an inclined plate portion 21B1 bent obliquely upward from the upper end of the fixed plate portion 21A toward a stopper member 27 described later, and the upper end (tip) side of the inclined plate portion 21B1. The latch plate 21B is formed of a guide plate portion 21B2 that is formed by folding substantially perpendicularly from the side, and the slant plate portion 21B1 and the guide plate portion 21B2 are bent in a "<" shape. It becomes the shape to do. The latching portion 21B of the stopper receiver 21 is formed in an obliquely bent shape so that the inclined plate portion 21B1 and the engaging claw portion 27B of the stopper member 27 described later are aligned with each other. The portion 27B is detachably hooked.

  In this case, the latching portion 21B of the stopper receiver 21 is latched with the inclined plate portion 21B1 on the engaging claw portion 27B of the stopper member 27 in a surface contact state as shown in FIG. Further, the guide plate portion 21B2 of the latching portion 21B is provided with a stopper receiver for smoothly guiding the engaging claw portion 27B of the stopper member 27 toward the inclined plate portion 21B1 when the engine cover 14 is closed downward. 21 has a guide function for elastically deforming the latching portion 21B in the opposite direction to the engaging claw portion 27B.

  24 is a support member that supports the stopper receiver 21 in a cantilever state, and the support member 24 is formed using a metal plate material such as L-shaped steel as shown in FIG. It is fixed to the upper end side of the column 8D of the building cover 8 using means such as welding. The support member 24 has a length dimension slightly larger than the width dimension of the stopper receiver 21 (fixed plate portion 21 </ b> A), and extends left and right along the front surface of the counterweight 7.

  The other side of the support member 24 in the length direction is a free end and is disposed in the vicinity of the corner located on the right side of the rear portion of the opening 9. At this position, the fixing plate portion 21A of the stopper receiver 21 is connected to the bolt 22, Positioning is performed via the nut 23. As a result, the stopper receiver 21 is disposed so that the latching portion 21B side protrudes upward from a position near the corner of the opening 9 on the right side of the rear portion as shown in FIG.

  Reference numeral 25 denotes a plate-like bracket that is fixed to the engine cover 14, and the bracket 25 supports a stopper member 27 described later in a cantilevered state at a position facing the stopper receiver 21. The bracket 25 is formed in a shape that increases bending rigidity by bending a metal plate (for example, a steel plate) in the width direction as shown in FIG. 8, and the inside of the engine cover 14 is shown in FIG. In the cantilever state, it extends in the width direction (front and rear of the vehicle). In FIG. 8, the engine cover 14 is omitted to clearly show the shape of the bracket 25.

  Here, the base end side of the bracket 25 is a joining plate portion 25A that is superposed and joined to the reinforcing plate 14G of the engine cover 14 as shown in FIGS. Moreover, the front end side of the bracket 25 becomes a seat plate portion 25B to which a stopper member 27 described later is screwed via, for example, two nuts 26 and 26 (see FIG. 8). A rectangular stopper insertion hole 25C is formed at an intermediate position with respect to 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 in the stopper insertion hole 25C of the bracket 25, the latching portion 21B of the stopper receiver 21 and the stopper member 27 as shown in FIG. The engaging claw portion 27B is inserted with a gap. The bracket 25 supports the stopper member 27 at a position facing the stopper receiver 21 and arranges the stopper member 27 at a position on the inner side in the width direction of the engine cover 14 relative to the stopper receiver 21.

  Further, as shown in FIG. 8, the bracket 25 is formed with left and right bent portions 25D and 25D at positions on both the left and right sides of the seat plate portion 25B and the stopper insertion hole 25C, and these bent portions are formed. 25D, when the latching portion 21B of the stopper receiver 21 is inserted into the stopper insertion hole 25C as shown in FIG. 6, the latching portion 21B is protected from the outside at this insertion position, and the stopper receiver 21 is latched. The stop portion 21B compensates for maintaining a stable engagement state with the engagement claw portion 27B of the stopper member 27.

  Reference numeral 27 denotes a stopper member provided in the engine cover 14 via a bracket 25. The stopper member 27 is formed by bending a metal plate such as a steel plate, and the engine is moved from the position of the handle 18 as shown in FIG. The cover 14 is disposed at a position spaced apart in the width direction (position on the rear side of the vehicle body). As shown in FIGS. 6 to 8, the stopper member 27 is formed by bending the fixing portion 27A located on the proximal end side thereof and the distal end side of the fixing portion 27A into a substantially “shi” shape. And the engaging claw portion 27B. Further, as shown in FIG. 8, bolt insertion holes 27 </ b> C and 27 </ b> C made of long holes are formed in the fixing portion 27 </ b> A of the stopper member 27.

  The engaging claw portion 27B of the stopper member 27 bends in the opposite direction to the latching portion 21B of the stopper receiver 21, and the latching portion of the stopper receiver 21 is placed in the stopper insertion hole 25C of the bracket 25 as shown in FIG. 21B is hooked so as to be back-to-back. For this reason, the stopper member 27 is configured so that the engaging claw portion 27B is fitted (inserted) into the stopper insertion hole 25C of the bracket 25 when the fixing portion 27A is fixed to the seat plate portion 25B of the bracket 25. It is attached to the tip side of.

  Reference numerals 28 and 28 denote bolts for fastening the stopper member 27 to the seat plate portion 25B of the bracket 25. These bolts 28 are inserted into the bolt insertion holes 27C of the stopper member 27 as shown in FIG. It is screwed onto the nut 26 via the seat plate portion 25B, whereby the base end side of the stopper member 27 is detachably fixed to the bracket 25.

  Here, the fixing portion 27A of the stopper member 27 is brought into contact with the seat plate portion 25B of the bracket 25 from the lower surface side, and the engaging claw portion 27B on the tip side is obliquely inserted into the stopper insertion hole 25C of the bracket 25 from below. Arranged to insert upwards. The mounting position of the engaging claw portion 27B in the stopper insertion hole 25C is adjusted in the length direction of the bracket 25 (front and rear direction of the vehicle body) by the bolt insertion hole 27C made of a long hole, thereby the stopper The position of the member 27 (engagement claw portion 27B) can be adjusted to a stable latching (engagement) position with respect to the stopper receiver 21 (latching portion 21B).

  Thus, the door closing stopper 20 holds the engine cover 14 in the closed state by hooking the engaging claw portion 27B of the stopper member 27 to the hooking portion 21B of the stopper receiver 21 in an elastically deformed state from the back side. is there. When the engine cover 14 is opened from such a closed state, the stopper member 27 is engaged with the stopper receiver 21 (engaged state) using the elastic deformation of the engine cover 14 as described later. ).

  Reference numeral 29 denotes a stay as an opening holding means for holding the engine cover 14 at the opening position, and the stay 29 holds the engine cover 14 in a largely opened state as shown in FIG. The stay 29 holds the engine cover 14 in an open state to prevent the engine cover 14 from being inadvertently closed during maintenance work described later.

  Next, 30 is a hydraulic oil tank provided on the revolving frame 5 at the right front part of the building cover 8 as shown in FIG. 2, and the hydraulic oil tank 30 is connected to the suction side of the hydraulic pump. In addition, return oil from a hydraulic actuator (not shown) is recirculated. A fuel tank 31 and the like for supplying fuel to the engine 10 are provided on the front side of the hydraulic oil tank 30.

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

  First, when an operator who has entered the cab 6 of the excavator 1 operates a start switch to start the engine 10 in the building cover 8, the engine 10 drives the hydraulic pump and the like. Then, when the operator appropriately tilts the operation lever or the like in the cab 6, the pressure oil from the hydraulic pump is used for traveling each hydraulic cylinder of the work device 4, the hydraulic motor for turning, or the lower traveling body 2. It is supplied to and discharged from a hydraulic motor (both not shown) and performs excavation work such as earth and sand.

  Further, when performing maintenance and inspection (maintenance work) of the engine 10, the heat exchanger 11, the cooling fan 12, and the like provided in the building cover 8, an operator climbing on the upper cover 8 </ b> B of the building cover 8 The engine cover 14 can be opened upward with the hinge 16 as a rotation fulcrum by lifting the handle 18 with one hand and lifting it upward (in the direction of arrow A in FIG. 5). The door opening operation can be performed with only one hand.

  That is, when opening the engine cover 14 held in the closed state, for example, the operator of the excavator 1 holds the handle 18 of the engine cover 14 with one hand and faces upward (direction A in FIG. 5). The cover plate portion 14A of the engine cover 14 is bent into a convex curve as shown by a two-dot chain line in FIG. The portion 14D and the rear plate portion 14E are elastically bent and deformed in the directions indicated by arrows B and B in FIG.

  The bracket 25 provided on the rear plate portion 14E side of the engine cover 14 via the reinforcing plate 14G has an arrow C as the rear plate portion 14E bends and deforms in the direction indicated by the arrow B in FIGS. Is pushed inward in the width direction of the engine cover 14. Thereby, the bracket 25 can be relatively moved in the direction in which the engaging claw portion 27B of the stopper member 27 is separated from the latching portion 21B (inclined plate portion 21B1) of the stopper receiver 21.

  In this way, by using the deformation of the engine cover 14 to move the stopper member 27 of the closing stopper 20 in the direction of separating from the latching portion 21B of the stopper receiver 21, the engaging claw portion 27B of the stopper member 27 is The latching state with respect to the stopper receiver 21 is forcibly released as illustrated in FIG.

  For this reason, for example, an operator of the excavator 1 can release the latching state of the closing stopper 20 by simply lifting the engine cover 14 in the door opening direction (upward) while holding the handle 18 of the engine cover 14. If the engine cover 14 is lifted upward as it is, the engine cover 14 can be easily moved to the door opening position shown in FIG.

  And in this door opening position, the engine cover 14 can be hold | maintained in the state opened largely by the stay 29 grade | etc.,. As a result, maintenance and inspection work for the engine 10, the heat exchanger 11, the cooling fan 12, and the like provided in the building cover 8 can be performed with confidence from the upper side of the opening 9.

  On the other hand, when closing the opening 9 of the building cover 8 with the engine cover 14, the stopper member 27 of the door stopper 20 is simply pushed downward, for example, while the engine cover 14 is rotated around the hinge 16. 5 and FIG. 6, the engine cover 14 can be easily held in the closed state.

  That is, when the engine cover 14 is closed downward, the guide plate portion 21B2 of the stopper receiver 21 causes the latching portion 21B to be engaged with the engaging claw portion 27B as the front end side of the engaging claw portion 27B comes into contact. Is elastically deformed in the opposite direction, whereby the engaging claw portion 27B of the stopper member 27 can be smoothly guided to the inclined plate portion 21B1 side, and the engine cover 14 can be easily held in the closed state. .

  Thus, according to the present embodiment, the closing stopper 20 for holding the engine cover 14 in the closed state is provided with the stopper receiver 21 fixed to the column 8D of the building cover 8 via the support member 24 and the like, and the engine cover 14 Since the reinforcing plate 14G is configured by the stopper member 27 provided via the bracket 25, the door closing stopper 20 can be configured in a simple structure, the cost of the door closing stopper 20 can be reduced, and at the time of assembly. The workability can be improved.

  Further, when the engine cover 14 is closed from the open state, the stopper member 27 of the door stopper 20 is elastically deformed to the latching portion 21B of the stopper receiver 21 only by pushing the handle 18 of the engine cover 14 downward, for example. The engine cover 14 can be easily held in the closed state.

  When opening the engine cover 14 held in the closed state by the door closing stopper 20, for example, an operator lifts the handle 18 of the engine cover 14 in the opening direction, and the lifting force (external force) lifts the entire engine cover 14. By elastically bending and deforming, the bending member can be used to move the stopper member 27 of the closing stopper 20 in the direction of separating from the latching portion 21B of the stopper receiver 21, and thereby the stopper for the stopper receiver 21. The latched state of the member 27 can be forcibly released.

  Accordingly, an operator who has climbed on the upper cover 8B of the building cover 8 to perform maintenance and inspection of the engine 10 or the like does not need to approach the position of the closing stopper 20 close to the counterweight 7, and the engine cover can be operated with only one hand. 14 can be easily opened and closed, and the burden on the operator can be greatly reduced as compared with the prior art using a catch or the like.

  That is, for example, when the operator opens and closes the engine cover 14, the engine cover 14 is opened or closed simply by gripping the handle 18 from a position on the front side of the vehicle body (upper cover 8 </ b> B) with respect to the engine cover 14. The engine cover 14 can be opened and closed without moving on the upper cover 8B to the rear side of the vehicle body (for example, the position of the counterweight 7).

  For this reason, the operator can open and close the engine cover 14 from a wide space position on the building cover 8 with peace of mind, which can reduce the burden on the operator and improve the workability, safety and the like with certainty. be able to. And maintenance and inspection (maintenance work) of engine 10 etc. which were stored in building cover 8 can be performed stably, and workability at the time of maintenance can also be improved.

  Further, since the stopper receiver 21 and the stopper member 27 of the door stopper 20 are structured to be accommodated between the opening 9 of the building cover 8 and the engine cover 14, like the catch used in the prior art. Without being exposed to external dust, rainwater, etc., durability, life, etc. as the closing stopper 20 can be reliably extended.

  Moreover, the height dimension of the engine cover 14 (the cover plate portion 14A) can be formed smaller than the left plate portion 14B where the hinge 16 is provided, and the right plate portion 14C where the handle 18 is provided. Thereby, a wide rear view from the cab 6 (cab) can be secured.

  In the above-described embodiment, the case where the latching portion 21B of the stopper receiver 21 is formed in a “B” shape is described as an example. However, the present invention is not limited to this, and the latch portion of the stopper receiver may be formed to be bent in, for example, a “V” shape or a “U” shape. Any configuration that can release the latched state of the stopper member with respect to the stopper receiver using the bending deformation of the engine cover 14 when the cover 18 is lifted upward from the closed state.

  Further, in the above-described embodiment, the case where the door closing stopper 20 is provided on one side in the width direction of the engine cover 14 (for example, the position on the rear right side of the opening 9 when viewed from the rear of the vehicle body) has been described as an example. However, the present invention is not limited to this. For example, the door closing stopper 20 may be provided in front and rear positions (both sides in the width direction of the engine cover 14) on the right side of the opening 9 when viewed from the rear of the vehicle body.

  On the other hand, in the said embodiment, when opening / closing the engine cover 14 on the upper cover 8B of the building cover 8, the case where the door opening direction was made into the left and right direction of a vehicle was mentioned as an example, and it demonstrated. However, the present invention is not limited to this. For example, the engine cover may be opened and closed upward in the front and rear directions of the vehicle.

  Moreover, in the said embodiment, the hydraulic excavator was mentioned as an example and demonstrated as a working machine. However, the present invention is not limited to this, and a configuration in which an opening for inspection provided on an upper portion of a building cover is opened and closed by an engine cover, such as a construction machine such as a hydraulic crane, a wheel loader, a forklift, or a transporting machine. It can be widely applied to various working machines.

1 is an overall view showing a hydraulic excavator according to an embodiment of the present invention. It is the top view which looked at the upper turning body in FIG. 1 from the upper side. It is a perspective view which expands and shows the rear part side of an upper turning body. It is a perspective view which shows the state which hold | maintained the engine cover in FIG. 3 in the door opening position. It is the expanded sectional view which looked at the opening part of a building cover, an engine cover, a closing stopper, etc. from the arrow VV direction in FIG. It is sectional drawing which expands and shows the door stopper etc. in FIG. It is sectional drawing in the same position as FIG. 5 which shows the state which opened the engine cover slightly. It is a disassembled perspective view which expands and shows the stopper receptacle of a door stopper, a support bracket, a stopper member, etc.

Explanation of symbols

1 Excavator (work machine)
2 Lower traveling body 3 Upper revolving body 4 Working device 5 Revolving frame (frame)
6 Cab 7 Counterweight 8 Building cover 8A Side cover 8B Upper cover 8C, 8D Post 8E Connecting beam 9 Opening 10 Engine 11 Heat exchanger 12 Cooling fan 14 Engine cover 14E Rear plate 14F, 14G Reinforcement plate 16 Hinge 17 Seal member 18 Handle 19 Locking device 20 Closing stopper 21 Stopper receiver 21B Latching portion 22, 28 Bolt 23, 26 Nut 24 Support member 25 Bracket 25C Stopper insertion hole 27 Stopper member 27B Engaging claw portion

Claims (4)

A vehicle body frame provided with a working device, an engine mounted on the frame, a building cover that surrounds the engine from the outside and is erected on the frame and has an opening on the upper side; An engine cover provided on the building cover so as to be openable and closable so as to cover the opening of the building cover, and a closing stopper for holding the engine cover in a closed state when the opening of the building cover is closed by the engine cover In a work machine comprising
The closing stopper is fixed to the building cover and is provided so as to be elastically deformable, and a stopper member fixed to the engine cover and detachably engaged with the stopper receiver. And consisting of
The stopper member is configured to release the engaged state with respect to the stopper receiver by utilizing the fact that the engine cover is elastically bent and deformed by an external force when the engine cover is lifted in the opening direction from the closed state. A working machine characterized by that.   The engine cover is provided with a hinge that serves as a pivot for opening and closing the engine cover on the building cover on one side in the length direction, and the engine cover is opened on the other side in the length direction. , A handle to be gripped when closing is provided at an intermediate position in the width direction, the stopper member of the closing stopper is disposed at a position spaced from the handle in the width direction of the engine cover, and the stopper receiver The work machine according to claim 1, wherein the work machine is configured to be disposed at a position on the outer side in the width direction of the engine cover relative to the member.   The stopper receiver has a latching portion that is bent from a position on the rear side of the vehicle body in the opening of the building cover and protrudes upward, and the stopper member includes a latching portion of the stopper receiver. The working machine according to claim 1, wherein the working machine has an engaging claw portion that is bent in a reverse direction and removably engages with the latching portion.   The engine cover is provided with a bracket having a stopper insertion hole formed extending inwardly from the outer side in the width direction of the engine cover, and the engagement claw portion is fitted into the stopper insertion hole at the distal end side of the bracket. The stopper member is provided so that the latching portion of the stopper receiver is inserted into the stopper insertion hole of the bracket when the engine cover is closed to engage with the engaging claw portion of the stopper member. The work machine according to claim 3.

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