JP4246663B2 - Construction machinery - Google Patents

Description

  The present invention relates to construction and construction of, for example, a hydraulic excavator and a hydraulic crane, and more particularly to a construction machine including an engine cover that covers an engine mounted on a vehicle body so as to be opened and closed.

  In general, construction machines such as a hydraulic excavator and a hydraulic crane are roughly configured by a vehicle body that can be self-propelled and a work device that is provided so as to be able to move up and down on an upper swing body that constitutes the vehicle body. The upper rotating body of the excavator is equipped with an engine as a power source, a hydraulic pump driven by the engine, a heat exchanger for cooling the engine, and the like. It is covered with an exterior cover provided on the revolving structure (see, for example, Patent Document 1).

JP 2002-348911 A

  Here, the exterior cover provided on the upper swing body of the hydraulic excavator is usually provided with an inspection port for inspecting equipment including the engine, and this inspection port is covered by the engine cover so as to be opened and closed. Yes. And the engine cover by the prior art mentioned above is the structure which opens and closes an inspection port by moving to the front and back direction (horizontal direction) along the surface (outer side surface) of an exterior cover.

  On the other hand, a rotary engine cover is known as another conventional engine cover. For example, the rotary engine cover is a fixed end that is rotatably supported by a hinge mechanism, and the lower end side is It is a free end that rotates upward and downward. The rotating engine cover is rotated upward and downward about the fixed end by the operator holding the handle provided on the free end side and lifting it upward. Is to release.

  However, the above-described rotary engine cover according to the prior art is configured to rotate upward and downward around the fixed end when the operator holds the handle on the free end side and lifts it upward. It has become.

  For this reason, in order to set the engine cover to the open position, the operator needs to lift the free end side of the engine cover greatly upward, and there is a problem that the operation of opening the engine cover is troublesome.

  When the engine cover is in the open position, the free end normally protrudes obliquely upward from the surface of the exterior cover.For example, when the upper swing body is turned while the engine cover is held in the open position, There is a possibility that the engine cover collides with an obstacle such as a standing tree existing around the upper revolving structure, and the engine cover is damaged.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a construction machine capable of easily opening and closing an engine cover during maintenance and inspection of equipment such as an engine. It is said.

In order to solve the above-described problems, the present invention includes a vehicle body that includes a self-propelled vehicle body, an engine mounted on the vehicle body, and an engine cover that can be opened and closed to cover the engine, and covers equipment mounted on the vehicle body. The present invention is applied to a construction machine including a cover and a link mechanism that moves an engine cover constituting the exterior cover substantially in parallel in the upward and downward directions between an open position and a closed position .

According to the first aspect of the present invention, the link mechanism is characterized in that the link mechanism has a fixed end rotatably connected to the vehicle body and a free end rotatably connected to the engine cover. A link member and a fixed end are pin-coupled to the vehicle body so that the fixed end is spaced upward and downward from the fixed end of the first link member, and a free end is upward and downward from the free end of the first link member. A second link member that is pivotally connected to the engine cover so as to be separated from the engine cover, and the engine cover provided between the vehicle body and one of the first and second link members. And an urging means for urging the engine cover to either the open position or the closed position when moving between the open position and the closed position, and the urging means is an operation of the link mechanism. According to the engine cover A tension spring having a maximum extension position between the position and the closed position, and the tension spring is moved when the engine cover exceeds the maximum extension position while moving from the closed position toward the open position. The engine cover is biased toward the closed position when the engine cover exceeds the maximum extension position while moving from the open position toward the closed position. is there.

The invention of claim 2 is that the tension spring is configured to hold the engine cover in the open position with a biasing force larger than its own weight when the engine cover is in the open position .

According to a third aspect of the present invention, one of the first and second link members is provided with an upper limit stopper that restricts the upward movement of the engine cover by abutting against the other link member. It is in the configuration .

According to a fourth aspect of the present invention, the upper limit stopper is constituted by a pin that connects one of the first and second link members to the vehicle body .

According to a fifth aspect of the present invention, the vehicle body is provided with a counterweight that covers the engine together with the exterior cover and has an inspection port for inspecting equipment including the engine, and the first and second link members. The fixed end is pivotally connected to the counterweight and the free end is pivotally connected to the engine cover. The engine cover is a free link of the first and second link members. The end is configured to move upward and downward between an open position where the counterweight inspection port is opened and a closed closed position by rotating upward and downward about the fixed end .

According to a sixth aspect of the present invention, the counterweight is provided with recesses for accommodating the engine cover on both the left and right sides of the inspection port, and the engine cover is located together with the inspection port when in the closed position. In other words, the left and right depressions are covered .

According to a seventh aspect of the present invention, the engine cover is provided with a lock mechanism having a claw member protruding toward the counterweight, and the lock mechanism is provided with the lock mechanism when the engine cover is in a closed position. A weight-side hook member that locks the engine cover in the closed position by engaging the claw member is provided, and the claw member of the lock mechanism is engaged with the link mechanism when the engine cover is in the open position. A link-side hook member that locks the engine cover in the open position by combining is provided .

According to an eighth aspect of the present invention, the link mechanism is constituted by a left and right link mechanism disposed in a pair between the counterweight and the engine cover in a pair of left and right directions. mechanism left, and connected by a connecting member extending in the right direction, the link-side hook member is to have a structure in which Ru is provided at a site consistent with the weight-side hook member and the left and right direction of the connecting member.

According to a ninth aspect of the present invention, there is provided a self-propelled vehicle body, an engine mounted on the vehicle body, and an inspection port located on the rear side of the engine and provided on the vehicle body for inspecting equipment including the engine. A counterweight provided, an engine cover provided so as to cover the counterweight inspection port so as to be openable and closable, and a link mechanism for moving the engine cover substantially parallel in an upward and downward direction between an open position and a closed position The link mechanism includes: a first link member having a fixed end rotatably connected to the vehicle body and a free end rotatably connected to the engine cover; and a fixed end. Is separated from the fixed end of the first link member in the upward and downward direction and is pivotally coupled to the vehicle body, and the free end is spaced apart from the free end of the first link member in the upward and downward direction. Can be rotated on the cover And the engine cover moves between an open position and a closed position provided between the second link member pin-coupled to the vehicle body, and the vehicle body and one of the first and second link members. And an urging means for urging the engine cover to either the open position or the closed position. The engine cover is provided with a lock mechanism having a claw member projecting to the counterweight side. The counterweight is provided with a weight-side hook member that locks the engine cover in the closed position by engaging the claw member of the lock mechanism when the engine cover is in the closed position. The link-side hook member that locks the engine cover in the open position by engaging the claw member of the lock mechanism when the engine cover is in the open position. In that the configuration of providing.

According to a tenth aspect of the present invention, the link mechanism is constituted by a left and right link mechanism that is disposed between the counterweight and the engine cover in pairs in the left and right directions. The mechanism is connected by a connecting member extending in the left and right directions, and the link side hook member is provided in a portion of the connecting member that coincides with the weight side hook member in the left and right directions .

According to the first aspect of the present invention , the engine cover can be moved substantially parallel in the upward and downward directions between the open position and the closed position by the first and second link members constituting the link mechanism . For this reason, when the engine cover is moved from the closed position to the open position during maintenance or inspection of the engine or the like, the lower end side of the engine cover does not lift up greatly, and the engine cover is opened and closed accordingly. Work can be done easily. Further, for example, the engine cover in the open position is larger than the surface of the exterior cover as compared to a rotating engine cover whose upper end is supported by a hinge mechanism and whose lower end is a free end that rotates upward and downward. Protruding can be suppressed, and damage to the engine cover can be prevented.
Also, when the engine cover is moved toward the open position, the tension spring biases the engine cover against its own weight to the open position, so that the engine cover can be easily moved to the open position. . On the other hand, when the engine cover is moved toward the closed position, the tension spring biases the engine cover to the closed position, whereby the engine cover can be held in the closed position.
Further, since the urging means is constituted by a tension spring that reaches a maximum extension position between the open position and the closed position of the engine cover, the tension spring is maximized while the engine cover moves from the closed position toward the open position. When the extended position is exceeded, the engine cover can be urged toward the open position by the tension spring that reduces. Further, when the maximum extension position is exceeded while the engine cover moves from the open position toward the closed position, the engine cover can be biased toward the closed position by the tension spring that is reduced.

According to the invention of claim 2 , the engine cover can be held in the open position by the urging force of the tension spring, so that maintenance and inspection work on the engine and other devices can be performed safely with the engine cover open. Can do.

According to the invention of claim 3, by providing an upper limit stopper on one of the first and second link members, when the engine cover moves from the closed position to the open position, one of the link members It is possible to restrict the upward movement of the engine cover at a position where the upper limit stopper provided on the upper end stopper abuts against the other link member. For this reason, the opening position of the engine cover can be appropriately changed by changing the position of the upper limit stopper or the shape of the other link member .

According to the fourth aspect of the present invention, it is possible to restrict the upward movement of the engine cover by using the pin that connects the one link member and the vehicle body as the upper limit stopper .

According to the invention of claim 5, the fixed ends of the first and second link members constituting the link mechanism are pin-coupled to the counterweight, and the free ends of the first and second link members are pin-coupled to the engine cover. Because the first and second link members are rotated upward and downward, the engine cover is moved upward and downward between the open position for opening the counterweight inspection port and the closed closed position. Can move in the direction .

According to the invention of claim 6, when the inspection port provided in the counterweight is closed by the engine cover in the closed position, the counterweight is provided on both the left and right sides of the counterweight sandwiching the inspection port. The recessed portion thus formed can be covered. As a result, for example, when the counterweight is formed by casting, the casting surface of the left and right hollow portions sandwiching the inspection port of the counterweight can be covered by the engine cover, and the construction machine viewed from the counterweight side Appearance beauty can be enhanced. In addition, surface processing such as grinding of the cast skin covered with the engine cover among the cast skin of the cast counterweight can be eliminated, and the manufacturing cost of the counterweight can be reduced .

According to the invention of claim 7, when the claw member of the lock mechanism provided on the engine cover is engaged with the weight side hook member, the engine cover can be locked in the closed position, and the claw member of the lock mechanism is linked to the link side. When engaged with the hook member, the engine cover can be locked in the open position. As a result, the engine cover can be securely held in the open position without relying on the urging force of the urging means, and maintenance and inspection work for the engine and other equipment can be performed safely with the engine cover open. it can. In addition, since the engine cover can be locked at two positions, that is, a closed position and an open position, using a single locking mechanism provided on the engine cover, the locking mechanism for locking the engine cover at the closed position and the opening position can be locked. It is not necessary to separately provide a lock mechanism for locking the position, and the configuration can be simplified .

According to the eighth aspect of the present invention , the engine cover can be supported at both ends with respect to the vehicle body by the link mechanism paired in the left and right directions, so that the engine cover is stable between the open position and the closed position. Thus, it can be moved upward and downward. In addition, the left and right link mechanisms are connected by a connecting member extending in the left and right directions, and the link side hook member is provided at a portion of the connecting member that coincides with the weight side hook member in the left and right directions. When the engine cover is in the closed position, the claw member of the lock mechanism can be engaged with the weight side hook member. When the engine cover is in the open position, the claw member of the lock mechanism is engaged with the link side hook member. it is possible to make.

According to the ninth aspect of the present invention, the first and second link members constituting the link mechanism cause the engine cover to move substantially upward and downward between the open position where the counterweight inspection port is opened and the closed position where the engine cover is closed. It can be moved in parallel. For this reason, when the engine cover is moved from the closed position to the open position during maintenance or inspection of the engine or the like, the lower end side of the engine cover does not lift up greatly, and the engine cover is opened and closed accordingly. Work can be done easily. Further, for example, the engine cover in the open position is larger than the surface of the exterior cover as compared to a rotating engine cover whose upper end is supported by a hinge mechanism and whose lower end is a free end that rotates upward and downward. Protruding can be suppressed, and damage to the engine cover can be prevented.
Further, when the engine cover is moved toward the open position, the urging means urges the engine cover to the open position against its own weight, so that the engine cover can be easily moved to the open position. it can. On the other hand, when the engine cover is moved toward the closed position, the urging means urges the engine cover to the closed position, whereby the engine cover can be held at the closed position.
Further, when the claw member of the lock mechanism provided on the engine cover is engaged with the weight side hook member, the engine cover can be locked in the closed position, and when the claw member of the lock mechanism is engaged with the link side hook member. The engine cover can be locked in the open position. As a result, the engine cover can be securely held in the open position without relying on the urging force of the urging means, and maintenance and inspection work for the engine and other equipment can be performed safely with the engine cover open. it can. In addition, since the engine cover can be locked at two positions, that is, a closed position and an open position, using a single locking mechanism provided on the engine cover, the locking mechanism for locking the engine cover at the closed position and the opening position can be locked. It is not necessary to separately provide a lock mechanism for locking the position, and the configuration can be simplified .

According to the tenth aspect of the present invention, the left and right link mechanisms are connected by the connecting member extending in the left and right directions, and the link member is linked to a portion that coincides with the weight side hook member in the left and right directions. Since the side hook member is provided, the claw member of the lock mechanism can be engaged with the weight side hook member when the engine cover is in the closed position, and the claw member of the lock mechanism is engaged when the engine cover is in the open position. The link side hook member can be engaged .

  Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to FIGS. 1 to 14, taking a hydraulic excavator as an example.

  First, FIG. 1 thru | or FIG. 9 shows the 1st Embodiment of this invention, 1 is a hydraulic excavator in the figure, The vehicle body of this hydraulic excavator 1 is the crawler type lower traveling body 2 which can be self-propelled, The upper rotating body 3 is mounted on the lower traveling body 2 so as to be able to turn. A swing post type working device 4 is provided on the front side of the upper swing body 3 so as to move up and down.

  Here, the upper swing body 3 includes a swing frame 6 provided on the lower traveling body 2 via a swing wheel 5, and on the swing frame 6, a cab 7 that defines a cab, and an engine described later. 8 etc. are arranged.

  Reference numeral 8 denotes an engine provided on the rear end side of the revolving frame 6, and the engine 8 is arranged in a horizontally placed state extending in the left and right directions. A hydraulic pump 9 driven by the engine 8 is provided on the left side of the engine 8, and a heat exchanger 10 such as a radiator and an oil cooler is provided on the right side of the engine 8. The devices such as the engine 8, the hydraulic pump 9, and the heat exchanger 10 are configured to be covered with a counterweight 11, an exterior cover 12, and the like which will be described later.

  A counterweight 11 is provided at the rear end of the revolving frame 6 and is located on the rear side of the engine 8, and the counterweight 11 balances the weight with the work device 4. Here, the counterweight 11 has a convex curved shape extending in an arc shape in the left and right directions, and is integrally formed by casting means. The counterweight 11 rises upward from the rear end of the swivel frame 6 and covers equipment such as the engine 8, the hydraulic pump 9, and the heat exchanger 10 from the rear side together with an exterior cover 12 described later ( (See FIG. 2).

  11A is a recess provided in an intermediate portion in the upper and lower directions of the counterweight 11, and the recess 11A is formed in the upper and lower directions of the rear surface 11B of the counterweight 11 as shown in FIGS. By forming (casting) the intermediate portion thinly, it is recessed toward the engine 8 over the entire region in the left and right directions. An engine cover 16 described later is accommodated in the recess 11A, and the engine cover 16 covers the surface of the recess 11A that has become a cast surface.

  Reference numeral 11 </ b> C is a rectangular inspection port provided at a central portion inside the recessed portion 11 </ b> A of the counterweight 11, and the inspection port 11 </ b> C is disposed at the left and right central portions of the counterweight 11. The inspection port 11C is opened and closed by the engine cover 16, and the operator performs maintenance and inspection work on the equipment such as the engine 8, the hydraulic pump 9, and the heat exchanger 10 through the inspection port 11C.

  11D and 11D are left and right link mounting seats projecting from the inner peripheral edge on the upper side of the inspection port 11C so as to face in the left and right directions. These left and right link mounting seats 11D are shown in FIG. As shown in FIG. 6, the counterweight 11 is integrally formed with an oval shape extending upward and downward along the inner peripheral edge of the inspection port 11 </ b> C. The left and right link mounting seats 11D are each configured to be attached with a link mechanism 19 described later.

  An exterior cover 12 is provided on the rear side of the revolving frame 6 continuously to the counterweight 11, and the exterior cover 12 is disposed on the left side of the rear portion of the revolving frame 6 as shown in FIGS. 11, a left rear cover 13 that is smoothly continuous from the left end side toward the front side, a right rear cover 14 that is disposed on the right side of the rear portion of the swivel frame 6 and that continues smoothly from the right end side of the counterweight 11 toward the front side, This is generally constituted by an engine cover 16 described later disposed between the left rear cover 13 and the right rear cover 14.

  The exterior cover 12 covers devices such as the engine 8, the hydraulic pump 9, the heat exchanger 10, and the control valve (not shown) disposed on the revolving frame 6 together with the counterweight 11 and the like.

  A left skirt cover 15 is provided on the left side of the front part of the revolving frame 6 between the revolving frame 6 and the cab 7. Similarly, a right skirt cover (not shown) is provided on the right side of the front part of the revolving frame 6. ) Is provided. The left skirt cover 15 and the right skirt cover constitute a part of the exterior cover 12.

  Reference numeral 16 denotes an engine cover that constitutes the exterior cover 12 together with the left rear cover 13 and the right rear cover 14. The engine cover 16 is supported by the counterweight 11 using a link mechanism 19 described later. The engine cover 16 is continuously disposed between the left rear cover 13 and the right rear cover 14 as shown in FIGS. 1 to 4, and can open and close the inspection port 11C of the counterweight 11 from the rear side. It covers something.

  Here, the engine cover 16 is integrally formed using, for example, a resin material, and has a left and right dimension larger than the upper and lower dimensions, and a convex curve corresponding to the recess 11A of the counterweight 11. It has a shape. The engine cover 16 is moved along the rear surface 11B of the counterweight 11 between an open position where the inspection port 11C of the counterweight 11 is opened and a closed position where the inspection port 11C is closed by a link mechanism 19 which will be described later. It moves almost parallel to the downward direction.

  In this case, when the engine cover 16 is in the open position, as shown in FIG. 3 and FIG. 4, the inspection port 11C of the counterweight 11 is opened over the entire area, and the operator can connect the engine 8 through the inspection port 11C. In addition, maintenance and inspection work can be performed on devices such as the hydraulic pump 9 and the heat exchanger 10.

  On the other hand, when the engine cover 16 is in the closed position, as shown in FIGS. 1 and 2, the engine cover 16 is fitted into the recess 11A of the counterweight 11, and the inspection port 11C and the inspection port 11C of the counterweight 11 are fitted. The surface (casting surface) of the hollow portion 11A located on both the left and right sides is covered from the rear side. In this case, the engine cover 16 forms a smooth surface continuous with the left rear cover 13 and the right rear cover 14.

  Thereby, the aesthetics of the external appearance of the hydraulic excavator 1 viewed from the counterweight 11 side can be enhanced, and surface processing such as grinding on the surface (cast surface) of the hollow portion 11A covered by the engine cover 16 can be eliminated. Thus, the production cost of the counterweight 11 can be reduced.

  Reference numeral 17 denotes a locking mechanism provided on the lower end side of the engine cover 16, and the locking mechanism 17 is a stopper 18 ( The engine cover 16 is locked in the closed position by engaging with it (see FIG. 4). Further, on both the left and right sides of the lock mechanism 17, there are provided handle portions 16 </ b> A that are gripped by an operator when the engine cover 16 is opened and closed.

  Reference numerals 19 and 19 denote left and right link mechanisms that move the engine cover 16 substantially parallel to the counterweight 11 in the upward and downward directions. Each link mechanism 19 is paired in the left and right directions to counterweight. 11 and the engine cover 16. The left and right link mechanisms 19 include a first link member 22, a second link member 26, a tension spring 29, and the like, which will be described later.

  Here, since the left and right link mechanisms 19 have the same configuration, the right link mechanism 19 will be described below with reference to FIGS. 5 to 9, and the description of the left link mechanism 19 will be omitted. It shall be.

  Reference numeral 20 denotes a vehicle body side base plate fixed to the counterweight 11 constituting the upper swing body 3, and the vehicle body side base plate 20 is formed into a pentagonal flat plate shape using a steel plate material or the like. The vehicle body side base plate 20 is fixed to the link mounting seat 11D of the counterweight 11 using two bolts 21 and 21, and the rear end portion of the vehicle body side base plate 20 projects rearward from the link mounting seat 11D. (See FIGS. 5 and 7). And the fixed end of the 1st link member 22 mentioned later and the fixed end of the 2nd link member 26 are pin-coupled to the rear-end part of the vehicle body side base board 20. As shown in FIG.

  Reference numeral 22 denotes a first link member whose fixed end is pin-coupled to the vehicle body side base plate 20, and the first link member 22 is formed in an elongated plate shape bent into a substantially S shape using a steel plate material or the like. . Here, the fixed end (one end portion in the length direction) of the first link member 22 is pivotally connected to the rear end portion of the vehicle body side base plate 20 using a pin 23 so as to be rotatable. Further, the free end (the other end in the length direction) of the first link member 22 is pin-coupled to a cover-side base plate 24 attached to the engine cover 16 using a pin 25 so as to be rotatable.

  Reference numeral 26 denotes a second link member whose fixed end is pin-coupled to the vehicle body side base plate 20, and the second link member 26 is formed in an elongated plate shape having a substantially I shape using a steel plate material or the like. Here, the fixed end (one end portion in the length direction) of the second link member 26 can be rotated using the pin 27 at a position spaced apart from the pin 23 on the vehicle body side base plate 20. Pin-coupled. Further, the free end (the other end in the length direction) of the second link member 26 can be rotated by using the pin 28 at a position spaced apart from the pin 25 on the cover side base plate 24. Pin-coupled.

  Here, as shown in FIGS. 5 and 7, etc., the distance between the pins 23 and 25 located at both ends of the first link member 22 and the distance between the pins 27 and 28 located at both ends of the second link member 26 are shown. Is set to be approximately equal to the distance. Further, the distance between the pins 23 and 27 and the distance between the pins 25 and 28 are set to be approximately equal. Thereby, the 1st link member 22 and the 2nd link member 26 comprise the parallel link.

  And the link mechanism 19 provided with the 1st link member 22 and the 2nd link member 26, the engine cover 16 attached to the cover side base board 24 is shown in the closed position shown in FIG.5 and FIG.6, FIG.7 and FIG. The inspection cover 11C of the counterweight 11 is opened and closed by the engine cover 16 by being moved substantially parallel in the upward and downward directions between the open position shown in FIG.

  Reference numeral 29 denotes a tension spring as an urging means provided between the first link member 22 and the vehicle body side base plate 20, and the tension spring 29 is constituted by a coil spring. Here, one end side of the tension spring 29 is latched by a latch pin 30 protruding from the vehicle body side base plate 20, and the other end side of the tension spring 29 is an intermediate portion in the longitudinal direction of the first link member 22. It is latched by the latching pin 31 protrudingly provided on. When the first link member 22 rotates about the pin 23, the tension spring 29 expands and contracts while rotating about the latching pin 30, and the engine cover 16 is opened or closed. It is configured to urge toward the side.

  Here, as shown in FIG. 9, the tension spring 29 becomes the maximum extended position where the pin 23 and the latching pins 30, 31 are aligned substantially in a straight line, and rotates in the direction indicated by the arrow A from the maximum extended position. When moving, the spring force biases the engine cover 16 toward the open position, and when rotating from the maximum extension position in the direction of arrow B, the spring force biases the engine cover 16 toward the closed position. To do.

  In this case, the spring force (biasing force) of the tension spring 29 is set to be larger than the weight of the engine cover 16 when the engine cover 16 is in the open position. Thus, when the engine cover 16 is moved to the open position, the engine cover 16 can be held in the open position by the tension spring 29.

  Reference numeral 32 denotes an upper limit stopper provided at the fixed end of the first link member 22, and the upper limit stopper 32 connects the fixed end of the first link member 22 to the vehicle body side base plate 20 as shown in FIGS. It is integrally formed with the connecting pin 23 and protrudes from the vehicle body side base plate 20 to the second link member 26 side. 7 and 8, when the engine cover 16 moves to the open position, the second link member 26 abuts so that the engine cover 16 moves upward further. And restricting movement.

  Accordingly, the upper limit stopper 32 and the second link member 26 collide with each other by changing the arrangement position of the upper limit stopper 32 with respect to the first link member 22 or by changing the shape of the second link member 26. The timing can be changed, and the opening position of the engine cover 16 can be appropriately set.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. The hydraulic excavator 1 is self-propelled to the work place by the lower traveling body 2 and then lifts the working device 4 while turning the upper revolving body 3. By moving, excavation work such as earth and sand is performed by the working device 4.

  Here, in the excavator 1 according to the present embodiment, the maintenance port 11C of the counterweight 11 is opened by the engine cover 16 when performing maintenance and inspection work on devices such as the engine 8, the hydraulic pump 9, and the heat exchanger 10. The operation of opening and closing can be easily performed. Hereinafter, the operation of opening and closing the inspection port 11C by the engine cover 16 will be described.

  First, when opening the inspection port 11C of the counterweight 11, the operator holds the handle portion 16A of the engine cover 16 with the lock mechanism 17 released, and moves the engine cover 16 upward from the closed position toward the open position. Lift up.

  In this case, the link mechanism 19 that supports the engine cover 16 constitutes a parallel link including the first link member 22, the second link member 26, and the like. For this reason, the engine cover 16 attached to the cover-side base plate 24 faces the rear surface 11B of the counterweight 11 from the closed position shown in FIGS. 5 and 6 toward the open position shown in FIGS. It can move upward in parallel.

  At this time, the tension spring 29 provided between the vehicle body side base plate 20 and the first link member 22 is centered on the latch pin 30 as the first link member 22 rotates about the pin 23. As a rotational displacement. Then, as shown in FIG. 9, the tension spring 29 reaches the maximum extension position when the engine cover 16 moves slightly upward from the closed position and the pins 23 and the latch pins 30 and 31 are substantially aligned. .

  Accordingly, when the tension spring 29 rotates in the direction of arrow A beyond the maximum extension position shown in FIG. 9 when the engine cover 16 moves from the closed position to the open position, the tension spring 29 gradually decreases. It becomes like this. As a result, the tension spring 29 urges the engine cover 16 toward the open position against the weight of the engine cover 16, and accordingly, the force necessary for the operator to lift the engine cover 16 is increased. Can be reduced.

  When the engine cover 16 moves to the open position shown in FIGS. 7 and 8, the upper limit stopper 32 formed integrally with the pin 23 that connects the vehicle body side base plate 20 and the first link member 22 is formed. The second link member 26 abuts. As a result, the engine cover 16 can be restricted from moving upward further, and the open position of the engine cover 16 can be set.

  In this case, the upper limit stopper 32 and the second link member 26 collide with each other by changing the arrangement position of the upper limit stopper 32 with respect to the first link member 22 or by changing the shape of the second link member 26. The timing to do can be changed. Therefore, the opening position of the engine cover 16 can be appropriately set by adjusting the arrangement position of the upper limit stopper 32.

  In this manner, the engine cover 16 is translated upward along the rear surface 11B of the counterweight 11 by the link mechanism 19 and is held in the open position shown in FIGS. The inspection port 11C is opened over the entire area. As a result, the operator can perform maintenance and inspection work on equipment such as the engine 8, the hydraulic pump 9, and the heat exchanger 10 through the inspection port 11C.

  In this case, since the engine cover 16 translates upward along the rear surface 11B of the counterweight 11, the ground height of the handle portion 16A when the engine cover 16 moves to the open position can be reduced, and the operator can The height for lifting the handle 16A can be kept low. For this reason, the burden on the operator when opening the engine cover 16 can be reduced compared to, for example, a rotating engine cover whose upper end is supported by a hinge mechanism and whose lower end is a free end.

  Further, when the engine cover 16 moves from the closed position to the open position, the tension spring 29 provided between the vehicle body side base plate 20 and the first link member 22 is indicated by an arrow from the maximum extension position shown in FIG. By rotating in the A direction, the engine cover 16 can be urged toward the open position by the spring force of the tension spring 29. Therefore, the burden on the operator when opening the engine cover 16 can be further reduced.

  Further, since the spring force of the tension spring 29 is set to be larger than the weight of the engine cover 16 when the engine cover 16 is in the open position, the engine cover 16 is held in the open position by the tension spring 29. I can leave. Therefore, maintenance and inspection work for equipment such as the engine 8 can be safely performed through the inspection port 11C.

  Further, since the engine cover 16 moves upward substantially parallel along the rear surface 11B of the counterweight 11, as shown in FIG. 3, when the engine cover 16 is in the open position, the counter of the engine cover 16 is The protruding length from the surface of the weight 11 (rear surface 11B) can be made as small as possible. For this reason, for example, even if the upper swing body 3 is swung while the engine cover 16 is held in the open position, the engine cover 16 is prevented from colliding with obstacles such as standing trees existing around the upper swing body 3. The engine cover 16 can be protected.

  Even when the engine cover 16 having a larger left and right dimension than the upper and lower dimensions is used, the counter cover 11 can be The inspection port 11C can be reliably opened over the entire area.

  Further, since the left and right link mechanisms 19 that are paired in the left and right directions are provided between the counterweight 11 and the engine cover 16, the engine cover 16 is attached by the left and right link mechanisms 19. Can support both ends. Therefore, even when the engine cover 16 having large left and right dimensions is used, the engine cover 16 can be stably translated upward and downward between the open position and the closed position.

  Next, when the engine cover 16 is moved from the open position to the closed position after the maintenance and inspection work for the equipment such as the engine 8, the hydraulic pump 9, and the heat exchanger 10 is completed, the operator The grip 16A of the engine cover 16 that holds the engine is gripped, and the engine cover 16 is lowered.

  As a result, the engine cover 16 supported by the link mechanism 19 faces the rear surface 11B of the counterweight 11 and moves downward from the open position shown in FIGS. 7 and 8 toward the closed position shown in FIGS. 5 and 6. Move almost parallel.

  Here, when the engine cover 16 moves from the open position toward the closed position, if the tension spring 29 rotates in the direction indicated by the arrow B beyond the maximum extension position shown in FIG. The engine cover 16 can be biased toward the closed position by the spring force of the tension spring 29.

  Then, the engine cover 16 is moved to the closed position, and the lock mechanism 17 is engaged with a stopper 18 (see FIG. 4) provided at the lower edge portion of the inspection port 11C of the counterweight 11, whereby the engine cover 16 is closed. Can be held in. Thereby, the engine cover 16 covers the inspection port 11C formed in the hollow portion 11A of the counterweight 11, and covers the surface (cast surface) of the hollow portion 11A located on the left and right sides of the inspection port 11C. .

  In this case, when the engine cover 16 is in the closed position, the tension spring 29 constantly urges the engine cover 16 toward the closed position. 16 can be held in the closed position, and the engine cover 16 can be prevented from unnecessarily moving to the open position.

  The engine cover 16 held in the closed position covers the cast surface of the left and right recesses 11A sandwiching the inspection port 11C of the counterweight 11 over the entire area. As a result, surface processing such as grinding of the cast surface of the hollow portion 11A covered by the engine cover 16 in the cast counterweight 11 can be eliminated, and the manufacturing cost of the counterweight 11 can be reduced correspondingly. . Further, since the engine cover 16 in the closed position forms a smooth surface continuous with the left rear cover 13 and the right rear cover 14, the aesthetics of the appearance of the hydraulic excavator 1 viewed from the counterweight 11 side can be improved. it can.

  Next, FIGS. 10 to 14 show a second embodiment of the present invention. The feature of this embodiment is that the engine cover is provided with a lock mechanism having a claw member protruding toward the counterweight side, and the counterweight is provided. Is provided with a weight side hook member that locks the engine cover to the closed position when the lock mechanism is engaged, and the link mechanism is a link side engagement member that locks the engine cover to the open position when the lock mechanism is engaged. It is in having established. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 41 denotes an engine cover used in the present embodiment instead of the engine cover 16 according to the first embodiment. The engine cover 41 is substantially the same as the engine cover 16 according to the first embodiment. It is formed in the convex curve shape corresponding to the hollow part 11A of the counterweight 11, and covers the inspection port 11C of the counterweight 11 so that it can be opened and closed from the rear side.

  The engine cover 41 is supported by a link mechanism 50, which will be described later, and a closed position for closing the inspection port 11C of the counterweight 11 as shown in FIG. 11, and an open position for opening the inspection port 11C of the counterweight 11 as shown in FIG. Between the counterweight 11 and the counterweight 11 along the rear surface 11B. Further, in the center of the lower end side of the engine cover 41, a recessed portion 41A that is recessed toward the inspection port 11C side of the counterweight 11 is provided, and a locking mechanism 42 described later is provided in the recessed portion 41A.

  Reference numeral 42 denotes a lock mechanism provided on the lower end side of the engine cover 41. The lock mechanism 42 engages a weight side hook member 47 described later to lock the engine cover 41 in the closed position shown in FIG. The engine cover 41 is locked in the open position shown in FIG. 12 by engaging with a link side hook member 64 described later.

  Here, as shown in FIG. 13, the lock mechanism 42 protrudes toward the inspection port 11 </ b> C side of the counterweight 11 from the rectangular box-shaped casing 43 attached to the recessed portion 41 </ b> A of the engine cover 41. The fixed claw member 44 having a bifurcated branching portion 44A on the protruding end side and a movable claw member 46 rotatably attached to the lower side of the fixed claw member 44 using a pin 45 are configured. ing.

  When the engine cover 41 is in the closed position, the fixing claw member 44 of the lock mechanism 42 sandwiches a weight side hook member 47 (described later) between the branch portions 44A as shown in FIG. When this happens, a link-side hook member 64 described later is sandwiched between the branch portions 44A as shown in FIG.

  On the other hand, the movable claw member 46 of the lock mechanism 42 is operated with a solid line in FIG. 13 around the pin 45 by operating an operation member (not shown) provided in the casing 43 from the outside of the engine cover 41. As shown in FIG. 13, the rotation is between a locking position for closing the branching portion 44 </ b> A of the fixed claw member 44 and a lock releasing position for opening the branching portion 44 </ b> A of the fixed claw member 44.

  Accordingly, when the movable claw member 46 is in the locked position shown by the solid line in FIG. 13, the lock mechanism 42 prohibits the movable claw member 46 from being detached from the weight side hook member 47 by the movable claw member 46. When the claw member 46 is in the unlocked position indicated by a two-dot chain line in FIG. 13, the fixed claw member 44 is allowed to be detached from the weight side hook member 47.

  47 is a weight side hook member provided on the counterweight 11, and the weight side hook member 47 is a lock mechanism provided on the engine cover 41 when the engine cover 41 is in the closed position shown in FIGS. When the fixed claw member 44 and the movable claw member 46 are engaged with each other, the engine cover 41 is locked in the closed position.

  Here, the weight side hook member 47 is formed by bending a round steel material or the like into a U shape, and both ends thereof are fixed to a base plate 48 formed in a rectangular flat plate shape by welding or the like. The weight side hook member 47 is formed into an inverted U-shape by fixing the base plate 48 to the lower end edge of the inspection port 11C formed in the counterweight 11 by using bolts 49, 49. It rises almost vertically upward from the lower edge of the.

  Thus, when the engine cover 41 is in the closed position, the fixed claw member 44 and the movable claw member 46 of the lock mechanism 42 are engaged with the weight side hook member 47 as shown in FIGS. The engine cover 41 can be locked in the closed position.

  50 and 50 are left and right link mechanisms which are arranged between the counterweight 11 and the engine cover 41 in pairs in the left and right directions. Each link mechanism 50 is connected to the counterweight 11 with respect to the engine cover. 41 is moved substantially in parallel in the upward and downward directions, and is used in this embodiment in place of the link mechanism 19 according to the first embodiment. The left and right link mechanisms 50 are constituted by a first link member 53, a second link member 57, a tension spring 60, etc., which will be described later, in substantially the same manner as in the first embodiment. The difference is that a link side hook member 64 described later is provided between the right link mechanisms 50.

  Here, since the left and right link mechanisms 50 have the same configuration, the right link mechanism 50 will be described below with reference to FIGS. 11 and 12, and the description of the left link mechanism 50 will be omitted. It shall be.

  Reference numeral 51 denotes a vehicle body side base plate fixed to the counterweight 11, and the vehicle body side base plate 51 is formed in a substantially rectangular flat plate shape using a steel plate material or the like, and links the counterweight 11 using bolts 52 and 52. It is fixed to the mounting seat 11D. A rear end portion of the vehicle body side base plate 51 protrudes rearward (on the engine cover 41 side) from the link mounting seat 11D, and a first link member 53 to be described later is fixed to the rear end portion of the vehicle body side base plate 51. The end and the fixed end of the second link member 57 are pin-coupled.

  Reference numeral 53 denotes a first link member whose fixed end is pin-coupled to the vehicle body side base plate 51, and the first link member 53 is formed in a long and narrow rectangular plate shape using a steel plate material or the like. Here, the fixed end (one end in the length direction) of the first link member 53 is pivotally connected to the rear end portion of the vehicle body side base plate 51 using a pin 54 so as to be rotatable. Further, the free end (the other end portion in the length direction) of the first link member 53 is pin-coupled to a cover-side base plate 55 attached to the engine cover 41 using a pin 56 so as to be rotatable.

  Reference numeral 57 denotes a second link member whose fixed end is pin-coupled to the vehicle body side base plate 51. The second link member 57 is formed in a long and narrow rectangular plate shape using a steel plate material or the like. Here, the fixed end (one end portion in the length direction) of the second link member 57 can be rotated using the pin 58 at a position spaced apart from the pin 54 on the vehicle body side base plate 51. Pin-coupled. Further, the free end (the other end portion in the length direction) of the second link member 57 can be rotated using a pin 59 at a position spaced apart from the above-described pin 56 on the cover-side base plate 55. Pin-coupled.

  Here, the distance between the pins 54 and 56 located at both ends of the first link member 53 and the distance between the pins 58 and 59 located at both ends of the second link member 57 are set to be approximately equal. Further, the distance between the pins 54 and 58 in the vehicle body side base plate 51 and the distance between the pins 56 and 59 in the cover side base plate 55 are set substantially equal. Thereby, the 1st link member 53 and the 2nd link member 57 comprise the parallel link.

  And the link mechanism 50 provided with the 1st link member 53 and the 2nd link member 57 supports the engine cover 41 via the cover side base board 55, and this engine cover 41 is shown in the closed position shown in FIG. 12 is opened / closed by opening and closing the check port 11C of the counterweight 11 by moving in an upward and downward direction substantially in parallel with the open position shown in FIG.

  Reference numeral 60 denotes a tension spring as an urging means provided between the first link member 53 and the vehicle body side base plate 51, and the tension spring 60 is constituted by a coil spring. Here, one end side of the tension spring 60 is latched by a latch pin 61 projecting from the vehicle body side base plate 51, and the other end side of the tension spring 60 is an intermediate portion in the longitudinal direction of the first link member 53. It is latched by a latch pin 62 projecting from the top.

  When the first link member 53 rotates about the pin 54, the tension spring 60 expands and contracts while rotating and displacing about the latch pin 61, and the engine cover 41 is directed from the closed position to the open position. Energize. Thus, the force required for the operator to lift the engine cover 41 from the closed position to the open position can be reduced by the spring force of the tension spring 60.

  Reference numeral 63 denotes a connecting member that connects the first link members 53 of the left and right link mechanisms 50. The connecting member 63 is formed in a rod shape that extends in the left and right directions using a round steel material or the like. The both ends of the connecting member 63 are fixed by welding or the like between the pins 54 and 56 of the left and right first link members 53, and the left and right directions are maintained while maintaining a substantially horizontal posture. It extends to.

  Reference numeral 64 denotes a link-side hook member provided between the left and right link mechanisms 50. The link-side hook member 64 is formed by bending a round steel material or the like into a substantially U shape. It is fixed to the middle part of the direction by welding or the like. When the engine cover 41 is in the open position shown in FIGS. 12 and 14, the link side hook member 64 is inverted U-shaped and rises substantially vertically upward from the connecting member 63, and is provided on the engine cover 41. When the fixed claw member 44 and the movable claw member 46 of the locking mechanism 42 are engaged, the engine cover 41 is locked in the open position.

  Here, as shown in FIG. 10, the link-side hook member 64 is provided in a portion of the connecting member 63 that coincides with the weight-side hook member 47 in the left and right directions. That is, when the axial center line of the portion of the weight side hook member 47 where the claw members 44 and 46 of the lock mechanism 42 are engaged is OO, the claw member 44 of the lock mechanism 42 of the link side hook member 64. , 46 is disposed at a portion where the axial center line OO and the connecting member 63 intersect.

  Accordingly, when the engine cover 41 is translated upward from the closed position shown in FIGS. 10 and 11 to the open position shown in FIGS. 12 and 14, each claw member 44 of the lock mechanism 42 provided on the engine cover 41. , 46 can be reliably engaged with the link-side hook member 64 fixed to the connecting member 63.

  The present embodiment includes the engine cover 41, the link mechanism 50, and the like as described above. Hereinafter, an operation for opening and closing the inspection port 11C of the counterweight 11 by the engine cover 41 will be described.

  First, when the engine cover 41 is in the closed position shown in FIG. 11, the fixed claw member 44 and the movable claw member 46 of the lock mechanism 42 are engaged with the weight side hook member 47 as shown by the solid line in FIG. Thus, the engine cover 41 is locked in the closed position.

  Then, when opening the engine cover 41 locked in the closed position as described above, the operator operates an operation member (not shown) provided in the casing 43 of the lock mechanism 42 from the outside of the engine cover 41. As a result, the movable claw member 46 of the lock mechanism 42 pivots from the lock position indicated by the solid line in FIG. 13 to the lock release position indicated by the two-dot chain line in FIG. .

  In this state, by lifting the engine cover 41 upward, the first link member 53 of the link mechanism 50 rotates upward about the pin 54 and the second link member 57 upwards about the pin 58. Rotate. In this case, since the first link member 53 and the second link member 57 constitute a parallel link, the engine cover 41 is moved from the closed position shown in FIG. 11 to the open position shown in FIG. It is possible to move upward substantially in parallel while facing the rear surface 11B.

  At this time, the tension spring 60 provided between the vehicle body side base plate 51 and the first link member 53 has a latching pin 61 as the first link member 53 rotates upward about the pin 54. The engine cover 41 is gradually reduced while rotating upward about the center, and the engine cover 41 is urged from the closed position toward the open position. Thereby, the force required for the operator to lift the engine cover 41 from the closed position to the open position can be reduced by the spring force of the tension spring 60.

  On the other hand, when the engine cover 41 moves to the open position shown in FIGS. 12 and 14, the link-side hook member 64 fixed to the connecting member 63 that connects the left and right first link members 53 is reversed U It becomes a letter shape and rises substantially vertically upward from the connecting member 63. Then, the fixed claw member 44 and the movable claw member 46 of the lock mechanism 42 provided on the engine cover 41 are engaged with the raised link side hook member 64 to lock the engine cover 41 in the open position. I can leave.

  Next, after the maintenance and inspection work for the equipment such as the engine 8 is completed, an operation member (not shown) provided in the casing 43 of the lock mechanism 42 is operated to move the movable claw member 46 of the lock mechanism 42. Is detached from the link side hook member 64.

  In this state, by pushing down the engine cover 41 downward, the engine cover 41 supported by the link mechanism 50 faces the rear surface 11B of the counterweight 11 and closes from the open position shown in FIG. Move downward in parallel toward the position.

  When the engine cover 41 is moved to the closed position, the claw members 44 and 46 of the lock mechanism 42 are engaged with the weight side hook member 47 so that the engine cover 41 is securely locked in the closed position. Can do.

  Thus, according to the present embodiment, when the engine cover 41 is moved to the open position, the claw members 44 and 46 of the lock mechanism 42 provided on the engine cover 41 are linked to the link side provided on the link mechanism 50. By engaging with the hook member 64, the engine cover 41 can be locked in the open position without depending on the spring force of the tension spring 60.

  For this reason, even if the spring force of the tension spring 60 decreases due to secular change or the like, or the tension spring 60 is damaged, the engine cover 41 is unexpectedly locked by locking the engine cover 41 in the open position by the lock mechanism 42. It is possible to reliably prevent the movement from the open position to the closed position. Therefore, maintenance and inspection work for equipment such as the engine 8 can be performed safely through the opened inspection port 11C.

  Moreover, according to the present embodiment, the engine cover 41 is provided with the single lock mechanism 42, and when the claw members 44 and 46 of the lock mechanism 42 are engaged with the weight side hook member 47, the engine cover 41 is closed. The engine cover 41 can be locked in the open position when the claw members 44 and 46 of the lock mechanism 42 are engaged with the link-side hook member 64. As described above, since the engine cover 41 can be locked at the two positions of the closed position and the open position by using the single lock mechanism 42 provided on the engine cover 41, the engine cover 41 is locked at the closed position. Therefore, it is not necessary to separately provide a lock mechanism for locking in the open position and a lock mechanism for locking in the open position, and the configuration can be simplified.

  In the first embodiment described above, the fixed end of the first link member 22 and the fixed end of the second link member 26 constituting the link mechanism 19 are pinned to the counterweight 11 via the vehicle body side base plate 20. The case where it couple | bonds is illustrated. However, the present invention is not limited to this, and for example, a structure in which a support column or the like is erected on the revolving frame 6 and the fixed end of the first link member 22 and the fixed end of the second link member 26 are pin-coupled to the support column or the like. Good. The same applies to the second embodiment.

  In the above-described first embodiment, the case where the tension spring 29 is provided between the vehicle body side base plate 20 and the first link member 22 is illustrated. However, the present invention is not limited to this. For example, a tension spring 29 may be provided between the vehicle body side base plate 20 and the second link member 26. The same applies to the second embodiment.

  Further, in the above-described first embodiment, the case where the tension spring 29 made of a coil spring is used as the biasing means is illustrated. However, the present invention is not limited to this. For example, a gas spring or the like may be used. The same applies to the second embodiment.

  Further, in the above-described first embodiment, the case where the upper limit stopper 32 is integrally formed on the pin 23 that couples between the vehicle body side base plate 20 and the first link member 22 is illustrated. However, the present invention is not limited to this. For example, the first link member 22 may be provided with a stopper alone at a position different from the pin 23. Furthermore, it is good also as a structure which provides a stopper in the 2nd link member 26 and abuts the said stopper to the 1st link member 22. FIG.

  Furthermore, in each embodiment mentioned above, the hydraulic excavator 1 is illustrated as a construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as a hydraulic crane and a wheel loader.

1 is a front view showing a hydraulic excavator to which a first embodiment of the present invention is applied. FIG. 2 is a right side view of FIG. 1 in which an exterior cover, a counterweight, an engine cover, and the like of a hydraulic excavator are viewed from the counterweight side. FIG. 3 is an enlarged front view showing an exterior cover, a counterweight, a link mechanism, an engine cover, and the like with the engine cover in an open position. FIG. 4 is an enlarged right side view of the exterior cover, counterweight, link mechanism, engine cover, and the like in FIG. 3 as viewed from the counterweight side. FIG. 5 is an enlarged view of a main part showing an enlarged view of the counterweight, inspection port, link mechanism, and the like in FIG. 4 with the engine cover in a closed position. FIG. 6 is an enlarged cross-sectional view of a main part when a counterweight, an inspection port, a link mechanism and the like are viewed from the direction of arrows VI-VI in FIG. 5. FIG. 6 is an enlarged view of a main part viewed from the same position as in FIG. 5, showing an enlarged view of the counterweight, inspection port, link mechanism, and the like with the engine cover in the open position. FIG. 8 is an enlarged cross-sectional view of a main part when a counterweight, an inspection port, a link mechanism and the like are viewed from the direction of arrows VIII-VIII in FIG. 7. FIG. 7 is an enlarged cross-sectional view of a main part similar to FIG. 6, showing a state in which the tension spring of the link mechanism is at the maximum extension position. It is the principal part enlarged view of the partial fracture | rupture which looked at the engine cover, the link mechanism, etc. by 2nd Embodiment from the inner side of the counterweight. It is an expanded sectional view seen from the arrow XI-XI direction in Drawing 10 which shows a lock mechanism, a weight side hook member, a link side hook member, etc. in the state where an engine cover was in a closed position. FIG. 12 is an enlarged cross-sectional view similar to FIG. 11 showing the lock mechanism, the weight side hook member, the link side hook member and the like with the engine cover in the open position. It is the expanded sectional view which looked at the engagement state of a lock mechanism and a weight side hook member from the arrow XIII-XIII direction in FIG. It is a partially broken perspective view showing an engine cover, a link mechanism, a lock mechanism, a link side hook member, etc. in a state where the engine cover is in an open position.

Explanation of symbols

1 Hydraulic excavator 2 Lower traveling body (vehicle body)
3 Upper swing body (car body)
4 Working device 8 Engine 9 Hydraulic pump 10 Heat exchanger 11 Counterweight 11A Recessed portion 11B Rear surface 11C Inspection port 12 Exterior cover 13 Left rear cover 14 Right rear cover 16, 41 Engine cover 19, 50 Link mechanism 22, 53 First link Member 23, 25, 27, 28, 54, 56, 58, 59 Pin 26, 57 Second link member 29, 60 Tension spring (biasing means)
32 Upper limit stopper 42 Lock mechanism 44 Fixed claw member 46 Movable claw member 47 Weight side hook member 63 Connecting member 64 Link side hook member

Claims (10)

A self-propelled vehicle body, an engine mounted on the vehicle body, an exterior cover that includes an engine cover that can be opened and closed to cover the engine, and covers equipment mounted on the vehicle body, and an engine that constitutes the exterior cover In a construction machine comprising a link mechanism that moves a cover between an open position and a closed position in a substantially parallel upward and downward direction ,
The link mechanism includes a first link member having a fixed end rotatably connected to the vehicle body and a free end rotatably connected to the engine cover, and a fixed end fixed to the first link member. The free end of the first link member is pivotally connected to the engine cover so that the free end is spaced upward and downward from the free end of the first link member. When the engine cover moves between an open position and a closed position provided between the second link member and the vehicle body and one of the first and second link members. An urging means for urging the cover to either the open position or the closed position;
The biasing means is constituted by a tension spring that expands and contracts in accordance with the operation of the link mechanism and reaches a maximum extension position between an open position and a closed position of the engine cover, and the tension spring closes the engine cover. When the maximum extension position is exceeded while moving from the position toward the open position, the engine cover is biased toward the open position, and the maximum extension position is reached while the engine cover moves from the open position toward the closed position. A construction machine characterized in that the engine cover is urged toward the closed position when the value exceeds . The construction machine according to claim 1 , wherein the tension spring is configured to hold the engine cover in the open position with an urging force larger than its own weight when the engine cover is in the open position. The first, on one of the link members of the second link member, by abutment to the other link member comprising a structure in which an upper limit stopper for restricting the upward movement of the engine cover according to claim 1 or The construction machine according to 2 . The construction machine according to claim 3 , wherein the upper limit stopper is configured by a pin that couples one of the first and second link members to the vehicle body. The vehicle body is provided with a counterweight having an inspection port for covering the engine together with the exterior cover and inspecting equipment including the engine,
The first and second link members are configured such that their fixed ends are pivotally coupled to the counterweight and the free ends are pivotally coupled to the engine cover,
The engine cover has an opening position for opening the inspection port of the counterweight and a closing position for closing the counterweight when the free ends of the first and second link members rotate upward and downward about the fixed end. The construction machine according to claim 1, 2, 3, or 4 , wherein the construction machine is configured to move upward and downward. The counterweight is provided with recesses for accommodating the engine cover on both the left and right sides of the inspection port. When the engine cover is in the closed position, the left and right recesses together with the inspection port are provided. The construction machine according to claim 5 , wherein the construction machine is configured to cover the part. The engine cover is provided with a lock mechanism having a claw member protruding toward the counterweight side,
The counterweight is provided with a weight-side hook member that locks the engine cover in the closed position by engaging the claw member of the lock mechanism when the engine cover is in the closed position.
The above link mechanism, according to claim 5 in which the pawl member of the locking mechanism when the engine cover is in the open position is be provided with a link-side hook members for locking the engine cover in an open position by engaging Or the construction machine of 6 . The link mechanism is composed of a left and right link mechanism disposed between the counterweight and the engine cover in pairs in the left and right directions, and the left and right link mechanisms are arranged in the left and right directions. The construction machine according to claim 7 , wherein the link side hook member is provided at a portion of the connection member that coincides with the weight side hook member in the left and right directions. A self-propelled vehicle body, an engine mounted on the vehicle body, a counterweight provided on the rear side of the engine and provided on the vehicle body and having an inspection port for inspecting equipment including the engine, A construction machine comprising an engine cover provided so as to open and close an inspection port of a counterweight, and a link mechanism for moving the engine cover in an upward and downward direction substantially parallel between an open position and a closed position In
The link mechanism includes a first link member having a fixed end rotatably connected to the vehicle body and a free end rotatably connected to the engine cover, and a fixed end fixed to the first link member. The free end of the first link member is pivotally connected to the engine cover so that the free end is spaced upward and downward from the free end of the first link member. When the engine cover moves between an open position and a closed position provided between the second link member and the vehicle body and one of the first and second link members. An urging means for urging the cover to either the open position or the closed position;
The engine cover is provided with a lock mechanism having a claw member protruding toward the counterweight side,
  The counterweight is provided with a weight-side hook member that locks the engine cover in the closed position by engaging the claw member of the lock mechanism when the engine cover is in the closed position.
  The link mechanism is provided with a link-side hook member that locks the engine cover in the open position by engaging a claw member of the lock mechanism when the engine cover is in the open position. And construction machinery. The link mechanism is composed of a left and right link mechanism disposed between the counterweight and the engine cover in pairs in the left and right directions, and the left and right link mechanisms are arranged in the left and right directions. The construction machine according to claim 9 , wherein the link side hook member is provided at a portion of the connection member that coincides with the weight side hook member in the left and right directions.

Images