JP5592835B2 - Walking type work machine - Google Patents

Description

  The present invention relates to a walking type work machine provided with a cover that covers an upper part of a machine body.

  As a walking type working machine configured as described above, Patent Document 1 includes a heat insulating plate at the top of the engine, an attachment portion is formed at the front portion of the heat insulating plate, and a fixing portion is provided at the rear portion of the heat insulating plate. The front end of the cover (bonnet in the literature) is locked and held with respect to the mounting part, and the rear end side of the cover is supported by fastening the bolt with respect to the fixed part, thereby covering the upper part of the aircraft The configuration for mounting is shown.

  In this walking type working machine of Patent Document 1, the bolt is separated from the fixed portion, and the front end side of the cover is separated from the mounting portion by lifting the rear end side of the cover, so that the cover can be removed. .

JP 11-189050 A

  Many walking-type work machines have a configuration including a cover that covers the upper part of the machine to protect the engine and fuel tank of the machine body and prevent adhesion of dust and the like. Considering this type of cover, a configuration in which the cover is removed for exchanging the engine spark plug and the engine is inspected, and a configuration in which the cover is freely opened and closed are also employed.

  In the case of using a fastening structure such as a screw as a structure for attaching the cover to the airframe, the number of parts is increased and the assembly process is increased. For this reason, for example, a configuration is adopted in which an engaging claw is formed on the cover, an engaged portion is formed on the body, and the engaging claw is engaged with the engaged portion using the elastic force of the cover. Thus, it is conceivable to reduce the number of screws used for attachment and to reduce the assembly process.

  However, in the configuration in which the cover is supported by the airframe by the engagement, the engagement becomes shallow due to vibration or the like during work, and the engagement claw may be separated from the engaged portion, so there is room for improvement.

  An object of the present invention is to rationally configure a walking work machine that stably supports a cover with respect to the machine body with a small number of parts.

  A feature of the present invention is a walking work machine provided with a cover that covers the upper part of the aircraft, wherein the cover is disposed at a position that covers the upper part of the aircraft, and an upper wall of the cover body. An opening / closing cover supported by a hinge mechanism so as to be openable / closable with respect to the cover main body so as to open / close the formed opening, and the cover main body includes the upper wall and a side portion of the upper wall. And an engaging claw for supporting the cover main body on the airframe projects outward from the airframe so as to engage with an engaged portion on the airframe side from the inside of the airframe. It is provided on the side wall in a posture, and the hinge mechanism is configured to swingably support an arm connecting to the lower surface of the base end side of the opening / closing cover on the lower surface of the upper wall, When opened upward, the opening The base end side of the cover is brought into contact with the upper surface of the upper wall of the cover body, and the side wall is urged outward by the pressing force caused by the contact, and the engaging claw is urged in the engaging direction. It is in the point which has the structure to do.

According to this configuration, the cover can be supported by the airframe in such a manner that the engaging claw of the cover body is engaged with the engaged portion on the airframe side, and the upper part of the airframe is opened by opening the open / close cover. The engine can be easily checked. In addition, when the engagement claw is provided on the side wall in a posture that projects outward from the body so as to engage with the engaged portion on the body side from the inside of the body, the opening / closing cover is opened. The base end side of the cover abuts against the upper surface of the upper wall of the cover body to apply a downward pressing force, and the downward pressing force by the contact urges the side wall outward to release the engaging claw. By urging the engaging claw, the engaging claw is displaced in a direction in which the engaging claw is engaged with the engaged portion, and the engaging claw and the engaged portion are reliably engaged.
As a result, the cover is supported with respect to the machine by a small number of parts, and the cover is stably supported with respect to the machine by ensuring the engagement of the engagement claw with the engaged portion every time the open / close cover is opened. The walking-type work machine is reasonably constructed.

  In the present invention, an engagement portion is formed on one end side in the front-rear direction of the cover main body, and a bolt insertion portion is formed inside the opening on the other end portion side. The cover body may be supported by the machine body by screwing the bolt inserted into the bolt insertion part into the machine body side.

  According to this, the engagement part on one end side of the cover body is engaged with the engaged part on the airframe side, and the bolt is inserted into the bolt insertion part inside the opening on the other end side of the cover body. As a result, the cover body can be screwed, and the cover body can be supported on the body while reducing the number of bolts as compared with the configuration using bolts instead of the engaged portion.

  In the present invention, a connecting member having a pair of arm portions that extend to the left and right positions of the spark plug while avoiding the spark plug on the upper surface of the engine is fixed to the engine, and a female screw portion into which the bolt is screwed is connected to the arm portion. The bolt insertion part may be formed at a position that is formed and overlaps the female screw part in the cover body.

  According to this, the cover main body can be supported on the airframe in such a manner that the bolt inserted into the bolt insertion portion of the cover main body is screwed into the female screw portion of the pair of arm portions of the connecting member fixed to the engine. In this support state, the engine spark plug can be easily removed and inspected.

  In the present invention, a fuel tank for storing fuel is disposed inside the opening of the cover body, and a sub female screw portion is formed at a position different from the female screw portion in the arm portion of the connecting member, A sub bolt insertion portion through which the sub bolt is inserted may be formed at a position overlapping with the sub female screw portion in the fuel tank.

  According to this, the fuel tank is supported on the fuselage in such a manner that the auxiliary bolt inserted into the auxiliary bolt insertion portion of the fuel tank is screwed into the auxiliary female screw portion of the pair of arm portions of the connecting member fixed to the engine. By doing so, it is not necessary to use a dedicated support member such as a stay for supporting the fuel tank on the airframe, and the number of parts can be reduced.

It is a whole side view of a walking type tiller. It is a whole top view of a walking type tiller. It is a vertical side view of the upper part of the airframe showing the arrangement of the airframe cover. It is a top view of an airframe. It is a top view of the airframe in the state where the airframe cover was removed. It is a vertical side view which shows the structure of a body cover. It is a top view which shows the structure of a body cover. It is a vertical side view of the disassembled state of a body cover. It is a top view of the body cover of the state which removed the opening / closing cover. It is a rear view which shows the body cover of the state which attached the cover main body. It is a rear view which shows the body cover of the state which removed the cover main body. It is a front view which shows the lock piece of an opening / closing cover. It is sectional drawing which shows the engaging claw of the state engaged with the to-be-engaged part. It is a perspective view which shows an engaging claw and a to-be-engaged part. It is sectional drawing which shows the closed state of the opening / closing cover, and the open state. It is sectional drawing which shows the state which the base end part contact | abutted the upper wall.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
〔overall structure〕
As shown in FIGS. 1 to 4, the engine 1 is provided at the front position, the transmission case 4 is provided to transmit the driving force of the engine 1 to the left and right wheels 2 and the rotary tiller 3. Is provided with a fuel tank 5 and an airframe cover A at the top, and the left and right handle rods 6 are provided in a form extending rearward from the airframe, and on the rear end side of the right handle rod 6. A walk-type tiller is configured as an example of a walk-type work machine by arranging the work operation unit W.

  In this walking type tiller, the left and right handle rods 6 have a structure in which the rear end positions thereof are connected by connecting rods 6A in a horizontal posture, and the base ends are supported so as to swing over the left and right handle rods 6. A clutch operating tool 8 is provided, and a main transmission lever 9 is provided from the upper part of the machine body to the rear. As shown in FIG. 1, the clutch operating tool 8 is spring-biased so as to be maintained in an upright position as viewed from the side, and in this upright position, the main clutch mechanism C is disengaged and the upper end side is swung rearward. The main clutch mechanism C is maintained in the engaged state by operating to a position overlapping the upper surface of the connecting rod 6A. The configuration of the main clutch mechanism C will be described later.

[Configuration of aircraft]
The mission case 4 has a configuration in which a main case portion 4A in a vertically oriented posture and a work case portion 4B that branches downward from the rear surface side of the main case portion 4A are integrally formed. An axle 11 that projects in the left-right direction is provided at the lower end of the work case, and a rotary shaft 20 that projects in the left-right direction is provided at the lower end of the work case portion 4B.

  The rotary tiller 3 includes a plurality of tilling claws 13 provided on the rotary shaft 20, a rotary cover 14 covering the top of the plurality of tilling claws 13, a resistance bar 15 that can be adjusted in the vertical direction, and a rotary cover. 14 and a leveling cover 16 made of rubber plate that hangs downward from the rear end.

  An input pulley 27 to which the driving force from the engine 1 is transmitted is provided on the left side surface of the upper end position of the transmission case 4, and a transmission mechanism for transmitting the driving force from the input pulley 27 to the axle 11 is incorporated in the main case portion 4A. The transmission mechanism is provided with a gear-type traveling transmission mechanism (not shown). In addition, a differential gear (not shown) that transmits a driving force from the transmission mechanism to the left and right axles 11 is built in the lower end portion of the main case portion 4A. The differential gear includes a differential lock mechanism (not shown) that can be switched between a non-diff lock state that allows independent rotation (differential) of the left and right axles 11 and a differential lock state that integrally rotates the left and right axles. The work case portion 4B is internally provided with a transmission mechanism that transmits the driving force from the input pulley 27 to the rotary shaft 20, and this transmission mechanism switches between a work transmission mechanism (not shown) and transmission and interruption in the transmission mechanism. And a working clutch mechanism (not shown).

  The traveling speed change mechanism and the work speed change mechanism described above are configured to be able to change the driving speed and to change the driving direction forward and backward, and these are shifted by the main speed change lever 9. The main speed change lever 9 is configured to be freely operated along the guide hole of the lever guide 19. By operating the main speed change lever 9, a change in the travel speed by the speed change operation of the travel speed change mechanism is realized, and the work speed change mechanism Setting of the driving speed of the rotary shaft 20 by the speed change operation is realized.

  A support frame 21 having a shape extending forward is connected to the front portion of the main case portion 4A, and the engine 1 is mounted on the support frame 21. The left side of the engine 1 is provided with an output pulley 26 that extracts the driving force of the engine 1, the right side surface of the engine 1 is provided with a recoil starter 23 that starts the engine 1 by pulling the handle 23A, and the left side surface is silenced with exhaust noise. A muffler 24 is provided.

  The main clutch mechanism C described above includes an output pulley 26 of the engine 1, an input pulley 27 at an upper position of the transmission case 4, an endless belt 28 wound around these, and a tension pulley 29 for controlling the tension of the endless belt 28. It has. In the main clutch mechanism C, a tension pulley 29 is supported on a swing end of a tension arm (not shown) supported so as to be swingable with respect to the airframe, and the tension arm and the clutch operating tool 8 are connected to an operation wire. Are linked by. With such a configuration, by setting the clutch operating tool 8 to the non-operating position, the tension acting on the endless belt 28 is released, and the main clutch mechanism C enters the power cut-off state (clutch disengaged state), and the clutch operating tool 8 is operated. By setting the position, tension is applied to the endless belt 28, and the main clutch mechanism C enters the transmission state (clutch engaged state).

[Work operation section]
As shown in FIG. 2, the work operation unit W includes a guide plate 31 fixed to the right handle rod 6 by welding, and an operation lever 32, a throttle lever 34, and an engine stop button 35. ing.

  The operation lever 32 is provided so as to be inserted into the guide groove 31G of the guide plate 31. Although a specific configuration is not shown in the drawings, the operation lever 32 is linked to the differential lock mechanism and the work clutch mechanism by an operation mechanism such as an operation wire, and the rotary tiller 3 and the differential lock are operated by operation in the front-rear direction. It is comprised so that operation with a mechanism can be performed.

  The throttle lever 34 is supported so as to be swingable about the vertical axis, and is connected to the throttle of the engine 1 by a wire (not shown) so as to obtain an engine rotation speed corresponding to the operation position.

  The engine stop button 35 is configured as a knob when supported so as to be rotatable between a stop position and an operation position and movable in the vertical direction, and the rotation position of the engine stop button 35 is below the guide plate 31. And a switch (not shown) for detecting the vertical position. The engine stop button 35 is spring-biased in the direction of the stop position. When the engine 1 is started, the engine stop button 35 is rotationally operated to the operating position while being pushed down, so that the engine 1 is mechanically held and can be started. . Thereafter, when the engine stop button 35 is pushed in while the engine 1 is operating, the engine stop button 35 rotates to the stop position and the engine 1 is forcibly stopped.

[Airframe cover]
As shown in FIGS. 3 to 16, the body cover A includes a cover body 41 disposed at an upper position of the body, and a cover body so as to open and close an opening 41 </ b> H formed in the upper wall 41 </ b> A of the cover body 41. An open / close cover 42 supported by a hinge mechanism 40 so as to be openable and closable with respect to 41 is provided, and an auxiliary cover 43 is provided at the rear position of the machine body.

  The cover body 41, the opening / closing cover 42, and the auxiliary cover 43 are made of resin, and the auxiliary cover 43 is disposed at a position covering the side of the lever guide 19 from the rear surface side of the transmission case 4 and is connected to the transmission case 4 by bolts or the like. ing. The cover main body 41 and the opening / closing cover 42 are arranged at positions that cover the upper side of the engine 1 and the fuel tank 5, the cover main body 41 is connected to the engine side by a connecting bolt 54, and the rear position is connected to the auxiliary cover 43. Engagement is supported.

  The auxiliary cover 43 is formed with an opening 43A surrounding the lever guide 19, and is connected to the lower side of the opening 43A to cover the rear wall body 43B of the transmission case 4 and covering the rear position of the work case portion 4B, and both sides of the opening 43A. An engagement hole 43D (see FIG. 11) is formed at an upper position of the wall portion surrounding the opening 43A. An engaged portion 43E is formed on the side wall body 43C of the auxiliary cover 43.

  As shown in FIGS. 3 and 5, a pair of left and right holding frames 45 connected to the lever guide 19 of the main transmission lever 9 are connected to the upper end position of the transmission case 4. A connecting frame 46 having a shape protruding forward from the front is formed. A stay 47 that is bolted to the upper position of the engine 1 is provided. A plate-like connecting member 48 that has a front end supported by the stay 47 and a rear end supported by the connecting frame 46 is provided at the upper position of the fuselage. ing.

  A pair of left and right arm portions 48A are formed at the front end portion of the connecting member 48, and a spark plug 1P of the engine 1 is disposed in a space that opens in the vertical direction at an intermediate position between the pair of arm portions 48A. In other words, an opening is formed on the front end side of the connecting member 48, and a pair of arm portions 48A is formed by members at the left and right positions of the opening, and an intermediate portion of the connecting member 48 is formed into a shape that goes around the lower side of the fuel tank 5. On the rear end side of the connecting member 48, a pair of projecting portions supported by the left and right connecting frames 46 are formed.

  The fuel tank 5 is made of resin, and a pair of left and right front support pieces 5A (an example of a sub bolt insertion portion) are integrally formed at the front end position, and a pair of left and right rear support pieces 5B at the rear end position are integrally formed. . The front support piece 5A is disposed at a position overlapping the upper surfaces of the left and right arm parts 48A of the connecting member 48, and is inserted into a through hole (not shown) formed in the front support piece 5A (sub-fixing bolt 50 An example of a bolt is screwed into a front fixing nut 51 (an example of an auxiliary female screw part) on the lower surface of the arm part 48A. Further, the rear support piece 5B is disposed at a position overlapping the upper surfaces of the left and right connecting frames 46, and rear fixing bolts 52 inserted into through holes (not shown) formed in the rear support pieces 5B are provided on the lower surface of the connecting frame 46. The rear fixing nut 53 is screwed. The rear fixing bolt 52 connects the rear support piece 5B of the fuel tank 5 and the rear end of the connecting member 48 to the connecting frame 46 in a tightened state. With such a configuration, the fuel tank 5 is connected to the fuselage. It is supported by.

  The cover body 41 has left and right side walls 41B formed in a posture that hangs down from both sides of the upper wall 41A, and a pair of support portions 41F (bolt insertion portions) projecting downward to the front position inside the opening 41H of the cover body 41 Example) is integrally formed. Further, a single connecting claw 41J (an example of an engaging portion) is formed at the rear end position of the cover body 41, and the left and right side walls 41B are engaged with the left and right side wall bodies 43C of the auxiliary cover 43. An engaging claw 41K is formed so as to protrude from the inner side of the aircraft so as to engage with the joint portion 43E (an example of an engaged portion on the aircraft side) from the inner side of the aircraft, and the right side wall 41B is positioned for positioning. The regulation piece 41L is formed.

  The engaging claw 41K is formed at the tip of a rib-shaped member that protrudes toward the inside of the machine body with respect to the inner wall surface of the side wall 41B, and is engaged with the engaged portion 43E of the cover main body 41. An engagement surface that prevents upward displacement is formed, and the engaged portion 43E has a shape that allows the engagement surface of the engagement claw 41K to contact the lower side.

  In a posture in which the body of the cover 41 is provided, the lower end portions of the left and right support portions 41F are arranged at positions where they overlap the upper portions of the left and right arm portions 48A of the connecting member 48, and bolt insertion holes ( The connecting bolt 54 inserted into the not-shown screw is screwed into the connecting nut 55 (an example of the female screw portion) on the lower surface of the arm portion 48A. In order to connect the support portion 41F and the arm portion 48A, a screw hole may be formed as a female screw portion without providing the connection nut 55 in the arm portion 48A. Similarly, a screw hole into which the front fixing bolt 50 is screwed is formed in the arm portion 48A, and a screw hole into which the rear fixing bolt 52 is screwed is formed in the connecting frame 46, so that the front fixing nut 51 and the rear portion are formed. A configuration without the fixing nut 53 may be adopted.

  As shown in FIGS. 6 to 9, the hinge mechanism 40 includes a pair of left and right pivot portions 40A projecting on the lower surface of the rear portion of the upper wall 41A of the cover body 41 from the opening 41H, and the rear end side of the opening / closing cover 42. And a hinge arm 40 </ b> B projecting from the lower surface. In addition, the hinge mechanism 40 includes a shaft support portion projecting on a coaxial core and a shaft in a sideways posture in the pivot support portion 40A by engaging the shaft support portion in a hole portion at the distal end portion of the hinge arm 40B in a relatively rotatable manner. A hinge arm 40B is supported so as to be swingable about an axial center in a lateral orientation with respect to the pivotal support portion 40A. As a configuration for supporting the hinge arm 40B on the pivotal support portion 40A, a shaft support portion is projected from the hinge arm 40B, and this pivotal support portion is engaged with a hole formed in the pivotal support portion 40A so as to be relatively rotatable. May be employed, and the pivotal support 40A may be provided with a shaft that penetrates the hinge arm 40B.

  A pair of lock pieces 42A are integrally formed at the front end of the opening / closing cover 42 so as to be elastically engaged with the opening edge at the front end position of the opening 41H and maintain the opening / closing cover 42 in a closed posture.

  With such a configuration, when the machine body cover A is provided in the machine body, the cover body 41 is previously supported by the hinge mechanism 40 so that the open / close cover 42 can be opened and closed, and the auxiliary cover 43 is connected to the machine body. Next, with the inclined posture with the front end side of the cover body 41 lifted up, the rear end connecting claw 41J is engaged with the engagement hole 43D of the auxiliary cover 43, and the operation of pushing down the front end side of the cover body 41 downward is performed. Thus, as shown in FIGS. 10 and 13, the left and right engagement claws 41 </ b> K formed on the left and right side walls 41 </ b> B of the cover main body 41 are engaged portions formed on the left and right side wall bodies 43 </ b> C of the auxiliary cover 43. Engage with 43E.

  At the time of this engagement, the side wall 41B of the cover body 41 and the side wall body 43C of the auxiliary cover 43 are elastically deformed to allow relative movement in a form in which the engagement claw 41K gets over the engaged portion 43E. The state is reached, and the outer surface of the side wall body 43C of the auxiliary cover 43 is connected with no step. When the cover main body 41 is supported in this manner, the restricting piece 41L formed on the side wall 41B of the cover main body 41 is in a positional relationship in contact with the inner surface of the side wall body 43C of the auxiliary cover 43 and moves outward of the cover main body 41. Displacement is regulated.

  Thus, in a posture in which the front end of the cover body 41 is pushed down, the pair of support portions 41F reach a position where they overlap the upper surfaces of the pair of arm portions 48A of the connection member 48, and the connection bolts are inserted into the bolt insertion holes formed in the support portion 41F. The cover main body 41 is supported by the machine body by inserting 54 and screwing it into the lower connecting nut 55 of the arm portion 48A.

[Open / close cover opening / closing operation]
When the opening / closing cover 42 is set in the closed posture, the pair of lock pieces 42A at the front end of the opening / closing cover 42 is engaged with the opening edge of the opening 41H of the cover main body 41 so that the closed state is maintained. When the opening 41H of the cover body 41 is opened by lifting the front part of the opening / closing cover 42, the upper surface of the engine 1 can be opened to check the replacement of the spark plug 1P of the engine 1 and the like. Fuel can be supplied to the tank 5.

  Particularly, in this walking type tiller, when the opening / closing cover 42 is largely opened, as shown in FIGS. 15 and 16, the base end portion 42T of the opening / closing cover 42 (specific example on the base end side of the opening / closing cover 42). Is in contact with the upper wall 41A of the cover main body 41 so that the base end portion 42T of the opening / closing cover 42 applies a pressing force that presses the upper wall 41A of the cover main body 41 downward. With this configuration, when the opening / closing cover 42 is opened and the base end portion 42T of the opening / closing cover 42 presses the upper wall 41A of the cover body 41 downward, the elastic deformation of the upper wall 41A of the cover body 41 is achieved. Thus, as shown by arrows in FIG. 16, the left and right side walls 41B of the cover body 41 are urged outward, and the engaging claws 41K formed on the left and right side walls 41B are attached in a direction to engage the engaged portion 43E. In this way, the engaging claw 41K is displaced outward from the machine body to ensure engagement.

  That is, by adopting a configuration in which the opening / closing cover 42 is largely opened and the base end portion 42T of the opening / closing cover 42 is brought into contact with the upper wall 41A of the cover body 41, for example, the engaging claws 41K are caused by vibration during operation. Even in a state of being displaced in a direction away from the engaged portion 43E, every time the opening / closing cover 42 is opened, the engaging claw 41K is positively biased in a direction to engage the engaged portion 43E. The cover main body 41 can be stably supported on the airframe by the displacement of the engaging claw 41K to the outside of the airframe due to this urging.

[Operation / Effect of Embodiment]
With such a configuration, since the fuselage cover A covers the upper parts of the engine 1, the fuel tank 5, and the transmission case 4, the inconvenience of dust and rainwater directly adhering to them is suppressed, and the engine sound transmitted to the operator is suppressed. Suppress. When checking the replacement of the spark plug 1P of the engine 1 or when refueling the fuel tank 5, the opening 41H of the cover main body 41 is enlarged by performing an operation of pulling the opening / closing cover 42 upward. Make it open and easy to work with. A connecting member 48 into which a connecting bolt 54 inserted through the through hole of the support portion 41F at the front position of the cover body 41 is screwed is provided in a region extending from the front position of the engine 1 to a position near the lever guide 19. Since the front support piece 5A and the rear support piece 5B of the fuel tank 5 are connected to the connecting member 48, a dedicated member for supporting the cover body 41 and a dedicated member for supporting the fuel tank 5 are individually provided. Therefore, the cover body 41 and the fuel tank 5 can be stably fixed to the single connecting member 48.

  Further, when the cover body 41 is supported by the machine body, the connecting claw 41J at the rear end is engaged with the engagement hole 43D of the auxiliary cover 43 in an inclined posture in which the front end side of the cover body 41 is lifted. The left and right engaging claws 41 </ b> K formed on the left and right side walls 41 </ b> B of the cover main body 41 by performing an operation of pushing down the front end side of the lower side 41 are engaged portions formed on the left and right side wall bodies 43 </ b> C of the auxiliary cover 43. 43E is engaged and held. Thereafter, the cover main body 41 is supported by the machine body by inserting the connection bolt 54 through the bolt insertion hole formed in the support portion 41F and screwing it into the connection nut 55 on the lower side of the arm portion 48A. . Thus, by supporting the cover main body 41 to the airframe by engagement, the number of bolts used for supporting the cover main body 41 to the airframe is reduced.

  When the open / close cover 42 is opened, the base end portion 42T of the open / close cover 42 abuts on the upper wall 41A of the cover main body 41 so as to apply a downward pressing force to the left and right side walls 41B of the cover main body 41. And the engaging claws 41K formed on the side wall 41B are securely engaged with the engaged portion 43E, and the cover body 41 can be stably supported.

[Another embodiment]
The present invention may be configured as follows in addition to the embodiment described above.

(A) An engagement claw 41K is formed at the front position and the rear position of the cover body 41, and the engagement claw 41K is engaged with the engaged portion 43E on the airframe side. With this configuration, it is not necessary to use bolts for supporting the cover main body 41 on the airframe, the number of parts can be reduced, and the operation of installing the cover main body 41 on the airframe is simplified.

(B) Instead of the connecting claw 41J formed at the end of the cover main body 41, a recess or hole for engagement is formed in this portion, and a projecting piece engaged with the recess or hole is provided in the body. May be.

(C) A stud body is provided in such a manner that a stud bolt is erected on the arm portion 48A of the connecting member 48, the stud bolt is inserted into a bolt insertion hole of the support portion 41F of the cover body 41, and a nut is screwed into the stud bolt. You may employ | adopt the structure which connects 41 to an airframe.

  INDUSTRIAL APPLICABILITY The present invention can be used for all walk-type work machines including a cover body and an opening / closing cover that is supported to be freely opened and closed with respect to the cover body.

1 Engine 1P Spark plug 5 Fuel tank 5A Sub bolt insertion part (front support piece)
40 Hinge mechanism 40B Arm (hinge arm)
41 Cover body 41A Upper wall 41B Side wall 41F Bolt insertion part (support part)
41H Opening 41J Engagement part (connection claw)
41K engaging claw 42 opening / closing cover 43E engaged portion 48 connecting member 48A arm portion 50 sub bolt (front fixing bolt)
51 Secondary female thread (fixing nut)
54 bolts (connection bolts)
55 Female thread (connection nut)
A cover (airframe cover)

Claims (4)

A walking work machine provided with a cover covering the top of the aircraft,
The cover body is disposed at a position covering the upper part of the airframe, and the cover body is opened and closed supported by a hinge mechanism so as to be opened and closed so as to open and close an opening formed in the upper wall of the cover body. With a cover,
The cover main body has the upper wall and a side wall formed in a posture that hangs down from a side portion of the upper wall, and an engaging claw for supporting the cover main body on the airframe is engaged on the airframe side. Provided on the side wall in a posture that projects to the outside of the aircraft so as to engage with the joint from the inside of the aircraft,
The hinge mechanism has a configuration in which an arm connected to the lower surface of the base end side of the opening / closing cover is swingably supported on the lower surface of the upper wall, and when the opening / closing cover is opened upward, The base end side of the opening / closing cover is brought into contact with the upper surface of the upper wall of the cover body, and the side wall is urged outward by the pressing force caused by this contact, and the engaging claw is attached in the engaging direction. A walk-behind working machine that has a structure to support.   An engaging portion is formed on one end side in the front-rear direction of the cover body, a bolt insertion portion is formed inside the opening on the other end side, and the engaging portion is engaged with the airframe side. The walking work machine according to claim 1, wherein the cover body is supported by the machine body by screwing a bolt inserted through the bolt insertion part into the machine body side.   A connecting member having a pair of arm portions extending to the left and right positions of the spark plug while avoiding the spark plug on the upper surface of the engine is fixed to the engine, and a female screw portion into which the bolt is screwed is formed on the arm portion. The walking work machine according to claim 2, wherein the bolt insertion part is formed at a position overlapping the female screw part in the cover body.   A fuel tank for storing fuel is disposed inside the opening of the cover body, and a sub female screw portion is formed at a position different from the female screw portion in the arm portion of the connecting member. The walking type work machine according to claim 3, wherein a sub bolt insertion portion through which the sub bolt is inserted is formed at a position overlapping with the sub female screw portion.

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