EP4675052A1 - Work machine - Google Patents

Work machine

Info

Publication number
EP4675052A1
EP4675052A1 EP24186190.5A EP24186190A EP4675052A1 EP 4675052 A1 EP4675052 A1 EP 4675052A1 EP 24186190 A EP24186190 A EP 24186190A EP 4675052 A1 EP4675052 A1 EP 4675052A1
Authority
EP
European Patent Office
Prior art keywords
cover member
shaft
support part
work machine
rotation position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP24186190.5A
Other languages
German (de)
French (fr)
Inventor
Antoine Gambier
Mathieu CONCAS
Pierre Goret
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yanmar Holdings Co Ltd
Original Assignee
Yanmar Holdings Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yanmar Holdings Co Ltd filed Critical Yanmar Holdings Co Ltd
Priority to EP24186190.5A priority Critical patent/EP4675052A1/en
Publication of EP4675052A1 publication Critical patent/EP4675052A1/en
Pending legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
    • E02F3/325—Backhoes of the miniature type
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
    • E02F9/0891—Lids or bonnets or doors or details thereof
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
    • E02F9/0883—Tanks, e.g. oil tank, urea tank, fuel tank

Definitions

  • the present invention relates to a work machine such as a hydraulic excavator.
  • Patent Document 1 EP 2107168 B1
  • a dedicated part of such a hinge is required.
  • a process is required in which the hinge is attached to both a support part which openably and closably supports the cover member with respect to the opening part, and the cover member. That is, an increase in the number of components of an opening and closing mechanism and an increase in assembling man-hours (a decrease in the assembling ability) occur. As a result, this makes the realization of the inexpensive opening and closing mechanism difficult.
  • the present invention has been made to solve the above issue; and its object is to provide a work machine in which a mechanism for opening and closing an opening part is realized without the need of a dedicated part such as a hinge, with a simplified structure and at low cost while the assembling ability of the mechanism can be improved.
  • a work machine is a work machine comprising a machinery room with an opening part, the work machine further comprising: a cover member which opens and closes the opening part; and a support part which is attached to the machinery room and rotatably supports the cover member, wherein in a state where the support part is attached to the machinery room, the cover member is rotated with respect to the support part within a first rotation range in which the opening part is openable and closable, while in a state where the support part is removed from the machinery room, the cover member is rotated with respect to the support part within a second rotation range including the first rotation range, and the second rotation range includes outside the first rotation range an attachment and detachment rotation position which allows the attachment and detachment of the cover member with respect to the support part.
  • a mechanism for opening and closing an opening part is realized with a simplified structure and at low cost while the assembling ability of the above-mentioned mechanism can be improved.
  • FIG. 1 is a side view illustrating a schematic configuration of a hydraulic excavator 1 that is an example of a work machine according to this embodiment.
  • the hydraulic excavator 1 comprises an undercarriage 2, a work machine 3, and an upper structure 4.
  • the gravity direction perpendicular to the front-back direction and the left-right direction is defined as the up-down direction
  • the upstream side in the gravity direction is defined as the "up”
  • the downstream side is defined as the "down”.
  • the hydraulic excavator 1 is illustrated in a state where the upper structure 4 is not revolved with respect to the undercarriage 2.
  • the front is indicated by symbol “F”
  • the rear is indicated by symbol “B”
  • the left is indicated by symbol “L”
  • the right is indicated by symbol "R”
  • the up is indicated by symbol "U”
  • the down is indicated by symbol "D”.
  • the undercarriage 2 comprises a pair of left and right crawlers 21 and a pair of left and right travel motors 22.
  • Each travel motor 22 is a hydraulic motor.
  • the undercarriage 2 further comprises a blade 23 for leveling ground, and a blade cylinder 23a for rotating the blade 23 in the up-down direction.
  • the work machine 3 comprises a boom 31, an arm 32, and a bucket 33.
  • the boom 31, the arm 32, and the bucket 33 are independently driven, excavation work of soil, sand, etc., can be carried out.
  • an attachment can also be attached appropriately.
  • breaking work or demolition work can be carried out by the breaker.
  • the boom 31, the arm 32, and the bucket 33 are respectively driven by a boom cylinder 31a, an arm cylinder 32a, and a bucket cylinder 33a.
  • the boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a are composed of hydraulic cylinders.
  • the hydraulic excavator 1 of this embodiment has a boom swing function in which the boom 31 swings left and right from the tip end 42a as the starting point.
  • the revolving frame 42 is provided with a swing cylinder 42b.
  • the swing cylinder 42b is configured with a hydraulic cylinder and swings the boom 31 through its extension and contraction.
  • the boom 31 has a shape which is bent forward at an obtuse angle, and is rotated up and down through the extension and contraction of the boom cylinder 31a.
  • the boom cylinder 31a is located on the further front side than the boom 31.
  • a base end of the boom cylinder 31a is supported by the boom bracket 421, and its tip end is coupled to a bend of the boom 31 so that the tip end is movable in a freely extended and contracted manner.
  • the arm 32 is rotatably connected to the tip end of the boom 31. The arm 32 is rotated up and down by the extension and contraction of the arm cylinder 32a.
  • a base end of the arm cylinder 32a is supported by the boom 31, and its tip end is coupled to the base end of the arm 32 so that the tip end is movable in a freely extended and contracted manner.
  • the bucket 33 is coupled to the tip end of the arm 32 via a link mechanism 34, and is rotated up and down by the extension and contraction of the bucket cylinder 33a.
  • the bucket cylinder 33a is supported by the arm 32 in its base end, and its tip end is coupled to the link mechanism 34 so that the tip end is extended and contracted.
  • the upper structure 4 is located above the undercarriage 2 and is provided revolvably with respect to the undercarriage 2.
  • an operation part 41 In the upper structure 4A, an operation part 41, the revolving frame 42, a revolving motor 43, and a machinery room 44 are arranged.
  • the upper structure 4 is revolved by driving the revolving motor 43 which is a hydraulic motor via a revolving bearing (not shown).
  • a plurality of hydraulic pumps (not shown) are arranged inside the machinery room 44.
  • Each of the hydraulic pumps supplies hydraulic oil (pressure oil) to hydraulic motors (for example, the left and right travel motors 22 and the revolving motor 43) and hydraulic cylinders via hydraulic piping.
  • the hydraulic cylinders include the boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a other than the blade cylinder 23a.
  • the hydraulic motors and the hydraulic cylinders which are driven by hydraulic oil being supplied from any hydraulic pumps are collectively called hydraulic actuators.
  • the operation part 41 is provided above the machinery room 44.
  • the driver seat 41a is arranged in the operation part 41.
  • Various operating levers 41b are arranged around the driver seat 41a. When the operator is seated on the driver seat 41a and operates the operating levers 41b, a predetermined hydraulic actuator is driven.
  • the driver seat 41a is arranged above a seat mount 46 (see FIG. 3 ).
  • the operation part 41 includes a canopy 45.
  • the canopy 45 is vertically provided in the rear of and above the machinery room 44, and at least covers the upper driver seat 41a. Meanwhile, a cabin may be provided instead of the canopy 45 (see FIG. 19 ).
  • Side walls of the machinery room 44 include a left hood (not shown), a right hood 44R and a rear hood 44B.
  • a vent 44a is provided in the right hood 44R.
  • the vent 44a is formed in the form of meshes.
  • a fuel tank (not shown) which contains fuel for fueling the engine 40 is provided.
  • the fuel tank is arranged in the machinery room 44 between the seat mount 46 and the right hood 44R, for example.
  • FIG. 2 and FIG. 3 are a partly enlarged side view and a partly enlarged perspective view showing the upper structure 4, respectively.
  • a support part 51 and a cover member 52 are arranged on the right side of the seat mount 46 and on the upper part of the right hood 44R.
  • FIG. 4 is an exploded perspective view of the support part 51 and the cover member 52.
  • a bracket 53 is fixed on the rear and upper part of the right hood 44R.
  • the support part 51 is attached to the right hood 44R (i.e., to the machinery room 44) via the bracket 53.
  • the support part 51 is detachably and attachably fixed to the bracket 53 using a bolt and a nut.
  • the support part 51 can be attached and detached with respect to the bracket 53.
  • the support part 51 may be directly fixed to the upper part of the right hood 44R by the bolt and the like.
  • the bracket 53 is not required.
  • the support part 51 has a triangular shape when viewed from above; however, the shape of the support part 51 is not specifically limited.
  • the cover member 52 is rotatably supported in front of the support part 51.
  • FIG. 5 and FIG. 6 are a partly enlarged side view and a partly enlarged perspective view showing the upper structure 4 with the cover member 52 being opened at the maximum rotation angle, respectively. Meanwhile, in FIG. 6 , the profile of the cover member 52 is indicated by dashed lines for the sake of convenience. As shown in FIG. 6 , when the cover member 52 is opened, an opening part 44P is exposed.
  • the opening part 44P is a through hole which is formed in the upper wall of the machinery room 44 between the seat mount 46 and the right hood 44R.
  • the opening part 44P is covered by the cover member 52 and is closed (see FIG. 2 and FIG. 3 ).
  • the cover member 52 is rotated and opened, the opening part 44P is exposed to the outside. Therefore, as described above, in the machinery room 44, when the fuel tank has been arranged between the seat mount 46 and the right hood 44R, the fuel tank is accessed via the opening part 44P by rotating and opening the cover member 52, which allows the fuel tank to be fueled.
  • blocking the opening part 44P by rotating the cover member 52 is also referred to as “closing the opening part 44P”.
  • exposing the opening part 44P by rotating the cover member 52 is also referred to as “opening (to open) the opening part 44P”.
  • An opening and closing mechanism 50 for opening and closing the opening part 44P is configured with the support part 51 and the cover member 52.
  • the hydraulic excavator 1 as a work machine of this embodiment comprises the machinery room 44 having the opening part 44P.
  • the hydraulic excavator 1 further comprises the cover member 52 which opens and closes the opening part 44P, and the support part 51 which is attached to the machinery room 44 (via the bracket 53, for example) and rotatably supports the cover member 52.
  • the rotation range of the cover member 52 within which the opening part 44P is openable and closable is defined as a first rotation range Ra1 (see FIG. 5 )
  • the cover member 52 is rotated within the first rotation range Ra1 in a state where the support part 51 is attached to the machinery room 44.
  • the first rotation range Ra1 includes a first rotation position P1 and a second rotation position P2.
  • the first rotation position P1 refers to a rotation position where the cover member 52 is rotated and closes the opening part 44P.
  • the second rotation position P2 refers to a rotation position where the cover member 52 is maximally rotated within the rotatable range and opens the opening part 44P.
  • FIG. 7-FIG. 9 are side views illustrating a procedure for attaching and detaching the support part 51 and the cover member 52. Meanwhile, in these figures, a solid arrow indicates a procedure for the removing direction of the cover member 52 from the support part 51, and a dashed arrow indicates a procedure for the attaching direction of the support part 51 and the cover member 52 to the machinery room 44. First, the procedure for the removing direction of the cover member 52 will be described.
  • the fixation of the support part 51 with respect to the bracket 53 is disengaged.
  • the fixation can be disengaged by unfastening and separating a bolt and a nut which had been used for the fixation of the support part 51 with respect to the bracket 53.
  • the support part 51 and the cover member 52 are integrally moved upward as shown in FIG. 7 .
  • the rotation position of the cover member 52 with respect to the support part 51 at this moment is defined as a reference position P0.
  • the posture (the rotation angle) of the cover member 52 with respect to the support part 51 in the reference position P0 is the same as the posture (the rotation angle) in which the cover member 52 is in the first rotation position P1 with respect to the support part 51 in a state where the support part 51 is attached to the machinery room 44.
  • the cover member 52 is rotated with respect to the support part 51 from the reference position P0 to an attachment and detachment rotation position Px.
  • the attachment and detachment rotation position Px refers to a rotation position of the cover member 52 which allows the attachment and detachment of the cover member 52 with respect to the support part 51.
  • the rotation direction of the cover member 52 from the reference position P0 toward the attachment and detachment rotation position Px is opposite to the rotation direction when the cover member 52 rotatably supported by the support part 51 is rotated from a state where the opening part 44P is closed to a state where the opening part 44P is opened, in a state where the the support part 51 is attached to the machinery room 44.
  • the cover member 52 When the cover member 52 reaches the attachment and detachment rotation position Px, the cover member 52 is detached from the support part 51 as shown in FIG. 9 . Meanwhile, when the cover member 52 is in a rotation position other than the attachment and detachment rotation position Px, the cover member 52 cannot be structurally detached from the support part 51; however, its details will be described later.
  • the cover member 52 is mounted to the support part 51 in the rotation position which takes the attachment and detachment rotation position Px (see FIG. 9 ). And the cover member 52 is rotated with respect to the support part 51 from the attachment and detachment rotation position Px to the reference position P0. Lastly, the support part 51 is fixed to the bracket 53 by using a bolt and the like (see FIG. 7 ). Thus, the attachment of the support part 51 and the cover member 52 to the machinery room 44 is completed.
  • FIG. 10 is an enlarged perspective view of the support part 51.
  • the support part 51 has a support body part 511 and a shaft part 512.
  • the support body part 511 has a recess part 511a.
  • the recess part 511a is formed in the front and center part of the support body part 511 in a rearward recessed manner.
  • the shaft part 512 is arranged in the recess part 511a.
  • the inside of the support body part 511 and the shaft part 512 is formed with a hollow; however, it may be a solid structure which is full of contents.
  • the shaft part 512 is arranged in the center axis around which the cover member 52 is rotated. This makes it possible for the cover member 52 to rotate about the shaft part 512.
  • the center axis AX passes through the shaft part 512 and extends in the left-right direction of the hydraulic excavator 1. Therefore, the shaft part 512 also extends in the left-right direction of the hydraulic excavator 1.
  • a pair of the shaft parts 512 (two shaft parts 512) is/are provided in the left-right direction and side by side.
  • Respective shaft parts 512 are respectively supported by a left side surface 511aL and a right side surface 511 aR of the recess part 511 a in the support body part 511. Meanwhile, there may be only one shaft part 512.
  • FIG. 11 is a schematic cross-sectional view of the support part 51 when it is cut in a plane perpendicular to the shaft part 512 (the center axis AX).
  • the shaft part 512 has a shape which extends in one direction D1 in the cross section perpendicular to the center axis AX. That is, in the above-described cross section, assuming that a direction perpendicular to the one direction D1 is other direction D2, the maximum diameter of the shaft part 512 in the other direction D2 is a first shaft diameter A1 (mm), and the maximum diameter of the shaft part 512 in the one direction D1 is a second shaft diameter A2 (mm), A2 > A1 is fulfilled.
  • the shaft part 512 has a pair of arc parts 512a and a pair of straight line parts 512b in the above cross section.
  • the pair of arc parts 512a faces each other in the one direction D1.
  • the pair of arc parts 512a each bulges in a direction away from the center axis AX (the radial direction), and is formed in an arc-shaped manner.
  • the pair of straight line parts 512b faces each other in the other direction D2.
  • the pair of straight line parts 512b extends in the one direction D1, and is each coupled to the adjacent arc parts 512a.
  • the one direction D1 is a forward, oblique and upward direction in the cross section, for example. Therefore, the pair of straight line parts 512b each extends forward, and obliquely and upward in the above cross section. Also, in the above cross section, of the pair of arc parts 512a, one arc part 512a is arranged in front of and above the other arc part 512a.
  • FIG. 12 is an enlarged perspective view of a side of the cover member 52 attached to the support part 51.
  • FIG. 13 is a cross-sectional view of the cover member 52.
  • the cover member 52 has a cover body 521.
  • the cover body 521 When the cover body 521 is in a rotation posture which closes the opening part 44P, the cover body 521 has a shape which droops downward as the cover body 521 heads from the support side by the support part 51 toward the front (see FIG. 2 ).
  • the inside of the cover body 521 is formed with a hollow; however, it may be a solid structure which is full of contents.
  • the cover member 52 further has a shaft containing part 522 and a communication path 523.
  • the shaft containing part 522 has a shape in which a cylinder is circumferentially partly cut out. The center axis of the cylinder extends in the left-right direction.
  • the shaft containing part 522 contains the shaft part 512 of the support part 51 inside.
  • the shaft containing part 522 is also a shaft receiving part which receives the shaft part 512 inside.
  • the shaft containing part 522 is provided pairwise (two of them are provided) in the left-right direction in accordance with the two shaft parts 512 of the support part 51. Meanwhile, when there is only one shaft part 512, only one shaft containing part 522 may also be provided.
  • a containing part support 524 is coupled to the rear of the cover body 521.
  • the containing part support 524 has an outer peripheral wall 524a, an inner wall 524b, and an outer wall 524c.
  • the outer peripheral wall 524a is arranged radially outside the two shaft containing part 522, and is coupled to the cover body 521.
  • the inner wall 524b and the outer wall 524c are arranged vertically in the left-right direction, and are respectively coupled to the outer peripheral wall 524a.
  • the inner wall 524b and the outer wall 524c are provided in accordance with the number of the shaft containing part 522.
  • two of a pair of the inner wall 524b and the outer wall 524c are provided in the left-right direction.
  • the outer wall 524c is arranged in the further right side than the inner wall 524b.
  • the outer wall 524c is arranged in the further left side than the inner wall 524b.
  • the shaft containing part 522 has an inner peripheral surface 522a.
  • the inner peripheral surface 522a is a surface that comes into contact with the outer peripheral surface of the shaft part 512 (for example, the arc part 512a) when the shaft part 512 is contained in the shaft containing part 522.
  • the inner peripheral surface 522a extends in the left-right direction, and is supported by the inner wall 524b and the outer wall 524c of the containing part support 524. In a word, the shaft containing part 522 is supported by the containing part support 524.
  • the shaft containing part 522 has a shape which recesses from the outer wall 524c toward the inner wall 524b.
  • the inner peripheral surface 522a has a shape along the pair of arc parts 512a of the shaft part 512.
  • the maximum inner diameter C (mm) of the inner peripheral surface 522a as shown in FIG. 13 is set at larger than or equal to the second shaft diameter A2 of the shaft part 512 (see FIG. 11 ).
  • the communication path 523 communicates with the shaft containing part 522.
  • the communication path 523 is provided as a passage when the shaft part 512 of the support part 51 is inserted into and removed from the shaft containing part 522 of the cover member 52.
  • the communication path 523 is coupled to an edge 522b (see FIG. 12 ) which is formed by circumferentially partly cutting out the cylindrical shaft containing part 522.
  • the communication path 523 is supported by the inner wall 524b and the outer wall 524c of the containing part support 524, as in the shaft containing part 522.
  • the width W (mm) of the communication path 523 is smaller than the maximum inner diameter C of the inner peripheral surface 522a.
  • the width W of the communication path 523 is set in further consideration of the size of the shaft part 512 (the first shaft diameter A1 and the second shaft diameter A2). Specifically, in the cross section perpendicular to the center axis AX, the width W of the communication path 523 is larger than or equal to the first shaft diameter A1 of the shaft part 512 and is smaller than the second shaft diameter A2.
  • the shaft part 512 of the support part 51 is contained in the shaft containing part 522 of the cover member 52, which allows the cover member 52 to be rotated with respect to the support part 51 to any position of the first rotation position P1, the second rotation position P2, and the attachment and detachment rotation position Px as mentioned above.
  • the relative positional relationship between the support part 51 and the cover member 52 in each of the first rotation position P1, the second rotation position P2 and the attachment and detachment rotation position Px will be described.
  • FIG. 14 is a cross-sectional view illustrating the positional relationship between the support part 51 and the cover member 52 when the cover member 52 is in the first rotation position P1 with respect to the support part 51 fixed to the machinery room 44.
  • the communication path 523 of the cover member 52 faces a first direction Q1 in the cross section perpendicular to the center axis AX (the shaft part 512) which is the rotation center of the cover member 52.
  • the first direction Q1 is downward, for example.
  • the first direction Q1 crosses the one direction D1 in which the shaft part 512 extends.
  • the width Ws of the shaft part 512 in the direction perpendicular to the first direction Q1 in the cross section is wider than the width W of the communication path 523. Therefore, the shaft part 512 cannot pass through the communication path 523 so that the shaft part 512 is not extracted from the shaft containing part 522 via the communication path 523. That is to say, the cover member 52 cannot be detached from the support part 51 and is supported in a rotatable manner with respect to the support part 51.
  • the case where the support part 51 has been removed from the machinery room 44 can also be considered as in the case where the support part 51 has been attached to the machinery room 44.
  • the cover member 52 is supported by the support part 51 which has been removed from the machinery room 44 in the same posture (at the same rotation angle) as in the case where the cover member 52 is in the first rotation position P1, the support part 51 and the cover member 52 come to a positional relationship as shown in FIG. 14 , and thus the cover member 52 cannot be detached from the support part 51.
  • FIG. 15 is a cross-sectional view illustrating the positional relationship between the support part 51 and the cover member 52 when the cover member 52 is in the second rotation position P2 with respect to the support part 51 fixed to the machinery room 44.
  • the rotation angle in the second rotation position P2 of the cover member 52 with respect to the support part 51 is defined as ⁇ 1 (°) with reference to the first rotation position P1.
  • the rotation direction of the cover member 52 from the first rotation position P1 toward the second rotation position P2 is defined as a positive direction, and the opposite direction is defined as a negative direction.
  • the communication path 523 of the cover member 52 faces a second direction Q2 in the cross section perpendicular to the center axis AX (the shaft part 512) which is the rotation center of the cover member 52.
  • the second direction Q2 is a direction oblique to the front side with respect to the first direction Q1 (see FIG. 14 ).
  • the second direction Q2 crosses the one direction D1 in which the shaft part 512 extends.
  • the width Ws of the shaft part 512 in the direction perpendicular to the second direction Q2 in the above cross section is wider than the width W of the communication path 523. Therefore, the shaft part 512 cannot pass through the communication path 523 so that the shaft part 512 is not extracted from the shaft containing part 522 via the communication path 523. That is to say, the cover member 52 cannot be detached from the support part 51 and is supported in a rotatable manner with respect to the support part 51.
  • the case where the support part 51 has been removed from the machinery room 44 can also be considered as in the case where the support part 51 has been attached to the machinery room 44.
  • the cover member 52 is supported with respect to the support part 51 which has been removed from the machinery room 44 in the same posture (at the same rotation angle) as in the case where the cover member 52 is in the second rotation position P2, the support part 51 and the cover member 52 come to a positional relationship as shown in FIG. 15 , and thus the cover member 52 cannot be detached from the support part 51.
  • FIG. 16 is a cross-sectional view illustrating the positional relationship between the support part 51 and the cover member 52 when the cover member 52 is in the attachment and detachment rotation position Px with respect to the support part 51.
  • the rotation angle of the cover member 52 with respect to the support part 51 in the attachment and detachment rotation position Px is defined as ⁇ 2 (°) with reference to the first rotation position P1.
  • ⁇ 2 is an angle whose direction is opposite to that of 01 (negative direction).
  • the communication path 523 of the cover member 52 faces a third direction Q3 in the cross section perpendicular to the center axis AX (the shaft part 512) which is the rotation center of the cover member 52.
  • the third direction Q3 is a direction oblique to the rear side with respect to the first direction Q1 (see FIG. 14 ).
  • the third direction Q3 comes parallel to the one direction D1 in which the shaft part 512 extends.
  • the width Ws of the shaft part 512 in the direction perpendicular to the third direction Q3 in the above cross section comes equal to the first shaft diameter A1 of the shaft part 512 (see FIG. 11 ).
  • the cover member 52 is relatively moved to a direction away from the support part 51 along the third direction Q3, thereby allowing the shaft part 512 to be relatively detached from the shaft containing part 522 via the communication path 523.
  • the cover member 52 can be detached from the support part 51.
  • the position of the communication path 523 which allows the shaft part 512 to pass through when the cover member 52 is rotated to the attachment and detachment rotation position Px with respect to the support part 51 is also referred to as a specific position PS (see FIG. 16 ).
  • FIG. 18 is an explanatory diagram together illustrating the first rotation position P1, the second rotation position P2 and the attachment and detachment rotation position Px of the cover member 52 with respect to the support part 51 described above.
  • the cover member 52 comes into contact with the upper part of the right hood 44R which constitutes the edge of the opening part 44P (see FIG. 2 , etc.). Because of this, the cover member 52 cannot be rotated from the first rotation position P1 to the negative direction (the (-) side in FIG. 18 ).
  • the cover member 52 can be rotated from the first rotation position P1 to the positive direction (the (+) side in FIG. 18 ) to reach the second rotation position P2 in which the cover member 52 opens the opening part 44P. Therefore, in the state where the support part 51 is attached to the machinery room 44, the cover member 52 can be rotated with respect to the support part 51 only within the first rotation range Ra1 in which the cover member 52 opens and closes the opening part 44P.
  • the rotation range between the second rotation position P2 and the attachment and detachment rotation position Px is also referred to as a second rotation range Ra2.
  • the first rotation range Ra1 (a range of 0°- ⁇ 1 in the rotation angle) is included in which the cover member 52 opens and closes the opening part 44P. Therefore, it can be said that in the state where the support part 51 is removed from the machinery room 44, the cover member 52 can be rotated with respect to the support part 51 within the second rotation range Ra2 which includes the first rotation range Ra1.
  • the attachment and detachment rotation position Px described above is located in the negative direction with respect to the first rotation position P1, that is to say, in the rotation direction opposite to the second rotation position P2. Because of this, it can be said that the attachment and detachment rotation position Px is outside the first rotation range Ra1.
  • the above second rotation range Ra2 includes outside the first rotation range Ra1 the attachment and detachment rotation position Px in which the cover member 52 is attachable and detachable with respect to the support part 51.
  • the cover member 52 As described above, by respectively defining the rotation range of the cover member 52 in the state where the support part 51 is attached to the machinery room 44 (the first rotation range Ra1), and the rotation range of the cover member 52 in the state where the support part 51 is removed from the machinery room 44 (the second rotation range Ra1), in the state where the support part 51 is attached to the machinery room 44, the cover member 52 is rotatably supported by the support part 51, and only in the state where the support part 51 is removed from the machinery room 44, the cover member 52 can be attached and detached with respect to the support part 51.
  • the first rotation range Ra1 the rotation range of the cover member 52 in the state where the support part 51 is attached to the machinery room 44
  • the second rotation range Ra1 the rotation range of the cover member 52 in the state where the support part 51 is removed from the machinery room 44
  • the opening and closing mechanism 50 for opening and closing the opening part 44P can be configured without the need of a dedicated part such as a hinge. Accordingly, with a simplified structure in which the support part 51 and the cover member 52 are combined, the opening and closing mechanism 50 is realized at low cost while the assembling ability of the opening and closing mechanism 50 can be improved. Moreover, by performing blow molding using a resin such as PP (polypropylene), for example, the support part 51 and the cover member 52 can be easily manufactured. Also in this regard, the opening and closing mechanism 50 can be realized inexpensively.
  • PP polypropylene
  • the communication path 523 is arranged in the specific position PS in which the shaft part 512 can pass through (see FIG. 16 ). Therefore, when the cover member 52 is in the attachment and detachment rotation position Px, the shaft part 512 can be relatively inserted to and removed from the shaft containing part 522 via the communication path 523, which allows the cover member 52 to be attached and detached with respect to the support part 51.
  • the communication path 523 faces the first direction Q1
  • the communication path 523 faces the second direction Q2
  • the communication path 523 faces the third direction Q3.
  • the communication path 523 faces a direction other than the third direction Q3 (for example, the first direction Q1 or the second direction Q2)
  • the insertion and removal of the shaft part 512 via the communication path 523 is not allowed while the cover member 52 can be rotatably supported by the support part 51.
  • the first direction Q1 is downward.
  • the second direction Q2 is a direction oblique to the front side with respect to the first direction Q1.
  • the third direction Q3 is a direction oblique to the rear side with respect to the first direction Q1.
  • the width W of the communication path 523 is larger than or equal to the first shaft diameter A1 of the shaft part 512 and is smaller than the second shaft diameter A2.
  • the shaft part 512 is allowed to pass through the communication path 523 and to be relatively inserted and removed with respect to the shaft containing part 522 (see FIG. 16 and FIG. 17 ).
  • the shaft part 512 cannot pass through the communication path 523, which does not allow the insertion and removal of the shaft part 512 with respect to the shaft containing part 522.
  • the attachment and detachment rotation position Px only when the cover member 52 is rotated and reaches the rotation position in which communication path 523 faces the specific direction (the attachment and detachment rotation position Px), the attachment and detachment of the cover member 52 is allowed with respect to the support part 51.
  • the pair of straight line parts 512b of the shaft part 512 extends in the one direction D1 in the cross section perpendicular to the center axis Ax, and is each coupled to the adjacent arc parts 512a.
  • the shaft part 512 having a cross-sectional shape in which the pair of straight line parts 512b extends in the one direction D1 is easily realized.
  • the cover member 52 is rotated and reaches an orientation in which the communication path 523 is along the pair of straight line parts 512b (an orientation along the one direction D1), the shaft part 512 is allowed to pass through the communication path 523 and to be inserted and removed with respect to the shaft containing part 522.
  • the attachment and detachment rotation position Px in order to reliably realize, via the communication path 523, the relative insertion and removal of the shaft part 512 with respect to the shaft containing part 522 and the attachment and detachment of the cover member 52 with respect to the support part 51, the following structure is desired. That is to say, when the cover member 52 is rotated to the attachment and detachment rotation position Px (when the communication path 523 faces the third direction Q3), it is desired that the communication path 523 and the straight line parts 512b of the shaft part 512 are parallel.
  • the pair of arc parts 512a of the shaft part 512 is arranged as follows. Namely, as shown in FIG. 11 , it is desired that of the pair of arc parts 512a, one arc part 512a is arranged in front of and above the other arc part 512a.
  • FIG. 19 is a perspective view illustrating another configuration of the hydraulic excavator 1.
  • the configuration of the support part 51 and the cover member 52 as shown in this embodiment, that is to say, the opening and closing mechanism 50 of the opening part 44P is certainly also applicable to the hydraulic excavator 1 having a cabin specification as shown in FIG. 19 .
  • the hydraulic excavator 1 in FIG. 19 has a configuration in which a cabin 47 is arranged in stead of the canopy 45 in FIG. 1 .
  • the cabin 47 has a door which is opened and closed when an operator gets on and off, and covers not only the upper part of the driver seat 41a, but also the front, rear, left and right perimeters of the driver seat 41a.
  • the support part 51 which rotatably supports the cover member 52 is attached to the machinery room 44 via a bracket (not shown).
  • the support part 51 is formed with a transversely long shape in which the support part 51 extends in the left-right direction, and is arranged in the rear of the cabin 47 and in the rear of the cover member 52. In this way, also by applying the configuration of this embodiment to the transversely long support part 51, effects of this embodiment can be obtained.
  • the configuration has been explained in which the support part 51 has the shaft part 512, and the cover member 52 has the shaft containing part 522 and the communication path 523; however, this embodiment is not limited to this configuration.
  • such a configuration is acceptable that the support part 51 has the shaft containing part 522 and the communication path 523, and the cover member 52 has the shaft part 512.
  • such a configuration is sufficient that one of the support part 51 and the cover member 52 has the shaft part 512, and the other has the shaft containing part 522 and the communication path 523.
  • Parts arranged in the machinery room 44 and in the space between the seat mount 46 (or the driver seat 41a) and the right hood 44R is not limited to the fuel tank illustrated in this embodiment.
  • parts such as a lead battery for suppling power to electrical equipment installed in the hydraulic excavator 1 (such as a monitor, a controller and illumination equipment), and a hydraulic oil tank for containing hydraulic oil.
  • a lead battery for suppling power to electrical equipment installed in the hydraulic excavator 1 such as a monitor, a controller and illumination equipment
  • a hydraulic oil tank for containing hydraulic oil.
  • the hydraulic excavator 1 which is a construction machine has been taken as an example and explained; however, the work machine is not limited to the hydraulic excavator 1, and it may be another construction machine such as a wheel loader and a compact track loader. Further, the work machine may be an agricultural machine such as a combine and a tractor.
  • the hydraulic excavator 1 as the work machine has a configuration comprising the engine 40 (see FIG. 1 ) as a motor; however, the motor may be an electric motor.
  • the hydraulic excavator 1 as the work machine may have a configuration in which hydraulic equipment such as a hydraulic actuator (a hydraulic motor, a hydraulic cylinder, for example) and an actuator driven by electric power are used concurrently.
  • hydraulic equipment such as a hydraulic actuator (a hydraulic motor, a hydraulic cylinder, for example) and an actuator driven by electric power are used concurrently.
  • the actuator driven by electric power include an electric travel motor, an electric cylinder, and an electric revolving motor.
  • a work machine is a work machine comprising a machinery room having an opening part, the work machine further comprising:
  • a work machine according to supplementary note (2) is the work machine according to supplementary note (1), wherein one of the support part and the cover member has
  • a work machine according to supplementary note (3) is the work machine according to supplementary note (2), wherein the communication path:
  • a work machine according to supplementary note (4) is the work machine according to supplementary note (3), wherein the shaft part has a shape extending in one direction in the cross section perpendicular to the center axis, and
  • a work machine according to supplementary note (5) is the work machine according to supplementary note (4), wherein the shaft part has, in the cross section:
  • a work machine according to supplementary note (6) is the work machine according to supplementary note (5), wherein the shaft containing part has an inner peripheral surface along the pair of arc parts of the shaft part.
  • a work machine according to supplementary note (7) is the work machine according to supplementary note (5) or (6), wherein the first direction is downward,
  • a work machine according to supplementary note (8) is the work machine according to supplementary note (7), wherein the straight line parts extend forward, and obliquely and upward in the cross section.
  • a work machine according to supplementary note (9) is the work machine according to supplementary note (8) or (9), wherein of the pair of arc parts, one arc part is arranged in front of and above the other arc part.
  • a work machine according to supplementary note (10) is the work machine according to any one of supplementary notes (5) to (9), wherein when the cover member is in the attachment and detachment rotation position, the straight line parts extend along the third direction.
  • a work machine according to supplementary note (11) is the work machine according to any one of supplementary notes (5) to (10), wherein the width of the communication path is wider than the maximum width of the pair of straight line parts in opposing directions.
  • a work machine according to supplementary note (12) is the work machine according to any one of supplementary notes (2) to (11), wherein the support part has the shaft part, and the cover member has the shaft containing part and the communication path.
  • the present invention is available for a work machine such as a construction machine and an agricultural machine, for example.

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  • Mining & Mineral Resources (AREA)
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  • Mechanical Engineering (AREA)
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Abstract

[Problem] A mechanism for opening and closing an opening part is realized without the need of a dedicated part such as a hinge, with a simplified structure, and at low cost. The assembling ability of the above mechanism is improved.
[Solution] A work machine comprises a machinery room having an opening part (44P). The work machine further comprises a cover member (52) which opens and closes the opening part, and a support part (51) which is attached to the machinery room and rotatably supports the cover member. In a state where the support part is attached to the machinery room (P1), the cover member is rotated with respect to the support part within a first rotation range (Ra1) within which the opening part is openable and closable, while in a state where the support part is removed from the machinery room, the cover member is rotated with respect to the support part within a second rotation range (Ra2) including the first rotation range. The second rotation range includes outside the first rotation range an attachment and detachment rotation position (Px) which allows the attachment and detachment of the cover member with respect to the support part.

Description

    TECHNICAL FIELD
  • The present invention relates to a work machine such as a hydraulic excavator.
    • BACKGROUND ART
  • Conventionally, in a revolving work machine comprising a driver seat and a tank room, a structure is known in which a tank cover body covering the tank room is provided via a hinge in a freely opened and closed manner (see Patent Document 1, for example).
    • PRIOR ART DOCUMENT PATENT DOCUMENT
  • Patent Document 1: EP 2107168 B1
    • SUMMARY OF INVENTION TECHNICAL PROBLEM
  • In a structure in which a cover member is opened and closed with respect to an opening part by using a hinge, a dedicated part of such a hinge is required. Moreover, a process is required in which the hinge is attached to both a support part which openably and closably supports the cover member with respect to the opening part, and the cover member. That is, an increase in the number of components of an opening and closing mechanism and an increase in assembling man-hours (a decrease in the assembling ability) occur. As a result, this makes the realization of the inexpensive opening and closing mechanism difficult.
  • The present invention has been made to solve the above issue; and its object is to provide a work machine in which a mechanism for opening and closing an opening part is realized without the need of a dedicated part such as a hinge, with a simplified structure and at low cost while the assembling ability of the mechanism can be improved.
    • SOLUTION TO PROBLEM
  • A work machine according to an aspect of the present invention is a work machine comprising a machinery room with an opening part, the work machine further comprising: a cover member which opens and closes the opening part; and a support part which is attached to the machinery room and rotatably supports the cover member, wherein in a state where the support part is attached to the machinery room, the cover member is rotated with respect to the support part within a first rotation range in which the opening part is openable and closable, while in a state where the support part is removed from the machinery room, the cover member is rotated with respect to the support part within a second rotation range including the first rotation range, and the second rotation range includes outside the first rotation range an attachment and detachment rotation position which allows the attachment and detachment of the cover member with respect to the support part.
    • ADVANTAGEOUS EFFECTS OF INVENTION
  • A mechanism for opening and closing an opening part is realized with a simplified structure and at low cost while the assembling ability of the above-mentioned mechanism can be improved.
    • BRIEF DESCRIPTION OF DRAWINGS
    • FIG. 1 is a side view illustrating a schematic configuration of a hydraulic excavator that is an example of a work machine according to an embodiment of the present invention.
    • FIG. 2 is a partly enlarged side view illustrating an upper structure of the hydraulic excavator.
    • FIG. 3 is a perspective view of the upper structure in FIG. 2.
    • FIG. 4 is an exploded perspective view illustrating a support part and a cover member of the hydraulic excavator.
    • FIG. 5 is a partly enlarged side view illustrating the upper structure in a state where the cover member is opened at the maximum rotation angle.
    • FIG. 6 is a perspective view of the upper structure in FIG. 5.
    • FIG. 7 is a side view illustrating one process of a procedure for attaching and detaching the support part and the cover member.
    • FIG. 8 is a side view illustrating another process of the procedure.
    • FIG. 9 is a side view illustrating a yet another process of the procedure.
    • FIG. 10 is an enlarged perspective view of the support part.
    • FIG. 11 is a schematic cross-sectional view of the support part when it is cut in a plane perpendicular to the shaft part.
    • FIG. 12 is an enlarged perspective view of a side in the cover member attached to the support part.
    • FIG. 13 is a cross-sectional view of the cover member.
    • FIG. 14 is a cross-sectional view illustrating a positional relationship between the support part and the cover member when the cover member is in a first rotation position with respect to the support part which is fixed to the machinery room in the upper structure.
    • FIG. 15 is a cross-sectional view illustrating a positional relationship between the support part and the cover member when the cover member is in a second rotation position with respect to the support part which is fixed to the machinery room.
    • FIG. 16 is a cross-sectional view illustrating a positional relationship between the support part and the cover member when the cover member is in an attachment and detachment rotation position with respect to the support part.
    • FIG. 17 is a cross-sectional view illustrating a state where the cover member is detached from the support part.
    • FIG. 18 is an explanatory diagram together illustrating the first rotation position, the second rotation position and the attachment and detachment rotation position of the cover member with respect to the support part.
    • FIG. 19 is a perspective view illustrating another configuration of the hydraulic excavator.
    DESCRIPTION OF EMBODIMENTS
  • An embodiment of the present invention based on the drawings will be explained as follows.
    • [1. Work machine]
  • FIG. 1 is a side view illustrating a schematic configuration of a hydraulic excavator 1 that is an example of a work machine according to this embodiment. The hydraulic excavator 1 comprises an undercarriage 2, a work machine 3, and an upper structure 4.
  • Here, respective directions are described according to the following definitions in this specification. The direction where an operator (pilot, driver) seated in a driver seat 41a in the upper structure 4 faces forward is defined as the front, and the opposite direction is defined as the back. Therefore, in a state where the upper structure 4 is not revolved with respect to the undercarriage 2 (a revolving angle of 0°), the front-back direction of the upper structure 4 coincides with the direction where the undercarriage 2 moves forward and backward. In addition, the left side viewed from the operator seated in the driver seat 41a is defined as the "left" and the right side is defined as the "right". Furthermore, the gravity direction perpendicular to the front-back direction and the left-right direction is defined as the up-down direction, the upstream side in the gravity direction is defined as the "up", and the downstream side is defined as the "down". In the drawings, the hydraulic excavator 1 is illustrated in a state where the upper structure 4 is not revolved with respect to the undercarriage 2. Moreover, in the drawings, the front is indicated by symbol "F", the rear is indicated by symbol "B", the left is indicated by symbol "L", the right is indicated by symbol "R", the up is indicated by symbol "U", and the down is indicated by symbol "D".
  • The undercarriage 2 comprises a pair of left and right crawlers 21 and a pair of left and right travel motors 22. Each travel motor 22 is a hydraulic motor. When the left and right travel motors 22 respectively drive the left and right crawlers 21, the hydraulic excavator 1 can be moved forward and backward. The undercarriage 2 further comprises a blade 23 for leveling ground, and a blade cylinder 23a for rotating the blade 23 in the up-down direction.
  • The work machine 3 comprises a boom 31, an arm 32, and a bucket 33. When the boom 31, the arm 32, and the bucket 33 are independently driven, excavation work of soil, sand, etc., can be carried out. Further, instead of the bucket 33, an attachment can also be attached appropriately. As the attachment, when a breaker is attached, breaking work or demolition work can be carried out by the breaker.
  • The boom 31, the arm 32, and the bucket 33 are respectively driven by a boom cylinder 31a, an arm cylinder 32a, and a bucket cylinder 33a. The boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a are composed of hydraulic cylinders.
  • A base end of the boom 31, that is, an end of the boom 31 which is opposite to a side connected to the arm 32, is swingably connected to a tip end 42a of a revolving frame 42 via a boom bracket 421. In other words, the hydraulic excavator 1 of this embodiment has a boom swing function in which the boom 31 swings left and right from the tip end 42a as the starting point. The revolving frame 42 is provided with a swing cylinder 42b. The swing cylinder 42b is configured with a hydraulic cylinder and swings the boom 31 through its extension and contraction.
  • The boom 31 has a shape which is bent forward at an obtuse angle, and is rotated up and down through the extension and contraction of the boom cylinder 31a. The boom cylinder 31a is located on the further front side than the boom 31. A base end of the boom cylinder 31a is supported by the boom bracket 421, and its tip end is coupled to a bend of the boom 31 so that the tip end is movable in a freely extended and contracted manner. The arm 32 is rotatably connected to the tip end of the boom 31. The arm 32 is rotated up and down by the extension and contraction of the arm cylinder 32a. A base end of the arm cylinder 32a is supported by the boom 31, and its tip end is coupled to the base end of the arm 32 so that the tip end is movable in a freely extended and contracted manner. The bucket 33 is coupled to the tip end of the arm 32 via a link mechanism 34, and is rotated up and down by the extension and contraction of the bucket cylinder 33a. The bucket cylinder 33a is supported by the arm 32 in its base end, and its tip end is coupled to the link mechanism 34 so that the tip end is extended and contracted.
  • The upper structure 4 is located above the undercarriage 2 and is provided revolvably with respect to the undercarriage 2. In the upper structure 4A, an operation part 41, the revolving frame 42, a revolving motor 43, and a machinery room 44 are arranged. The upper structure 4 is revolved by driving the revolving motor 43 which is a hydraulic motor via a revolving bearing (not shown). Inside the machinery room 44, in addition to an engine 40 that provides power to respective parts, a plurality of hydraulic pumps (not shown) are arranged.
  • Each of the hydraulic pumps supplies hydraulic oil (pressure oil) to hydraulic motors (for example, the left and right travel motors 22 and the revolving motor 43) and hydraulic cylinders via hydraulic piping. The hydraulic cylinders include the boom cylinder 31a, the arm cylinder 32a, and the bucket cylinder 33a other than the blade cylinder 23a. The hydraulic motors and the hydraulic cylinders which are driven by hydraulic oil being supplied from any hydraulic pumps are collectively called hydraulic actuators.
  • The operation part 41 is provided above the machinery room 44. The driver seat 41a is arranged in the operation part 41. Various operating levers 41b are arranged around the driver seat 41a. When the operator is seated on the driver seat 41a and operates the operating levers 41b, a predetermined hydraulic actuator is driven. The driver seat 41a is arranged above a seat mount 46 (see FIG. 3).
  • The operation part 41 includes a canopy 45. The canopy 45 is vertically provided in the rear of and above the machinery room 44, and at least covers the upper driver seat 41a. Meanwhile, a cabin may be provided instead of the canopy 45 (see FIG. 19).
  • Side walls of the machinery room 44 include a left hood (not shown), a right hood 44R and a rear hood 44B. In the right hood 44R, a vent 44a is provided. The vent 44a is formed in the form of meshes. When a fan (not shown) which is arranged inside the machinery room 44 is driven, air inside the machinery room 44 is evacuated to the outside via the vent 44a.
  • In the machinery room 44, a fuel tank (not shown) which contains fuel for fueling the engine 40 is provided. The fuel tank is arranged in the machinery room 44 between the seat mount 46 and the right hood 44R, for example.
  • FIG. 2 and FIG. 3 are a partly enlarged side view and a partly enlarged perspective view showing the upper structure 4, respectively. On the right side of the seat mount 46 and on the upper part of the right hood 44R, a support part 51 and a cover member 52 are arranged.
  • FIG. 4 is an exploded perspective view of the support part 51 and the cover member 52. On the rear and upper part of the right hood 44R, a bracket 53 is fixed. The support part 51 is attached to the right hood 44R (i.e., to the machinery room 44) via the bracket 53. The support part 51 is detachably and attachably fixed to the bracket 53 using a bolt and a nut. In other words, the support part 51 can be attached and detached with respect to the bracket 53. Meanwhile, the support part 51 may be directly fixed to the upper part of the right hood 44R by the bolt and the like. In this case, the bracket 53 is not required. As shown in FIG. 2 and FIG. 3, the support part 51 has a triangular shape when viewed from above; however, the shape of the support part 51 is not specifically limited. The cover member 52 is rotatably supported in front of the support part 51.
  • When the front end of the cover member 52 is lifted from the state in FIG. 2 and FIG. 3, the cover member 52 is rotated so as to open its front side with respect to the support part 51. FIG. 5 and FIG. 6 are a partly enlarged side view and a partly enlarged perspective view showing the upper structure 4 with the cover member 52 being opened at the maximum rotation angle, respectively. Meanwhile, in FIG. 6, the profile of the cover member 52 is indicated by dashed lines for the sake of convenience. As shown in FIG. 6, when the cover member 52 is opened, an opening part 44P is exposed. The opening part 44P is a through hole which is formed in the upper wall of the machinery room 44 between the seat mount 46 and the right hood 44R.
  • In a state where the cover member 52 is closed, the opening part 44P is covered by the cover member 52 and is closed (see FIG. 2 and FIG. 3). On the other hand, as illustrated in FIG. 6, when the cover member 52 is rotated and opened, the opening part 44P is exposed to the outside. Therefore, as described above, in the machinery room 44, when the fuel tank has been arranged between the seat mount 46 and the right hood 44R, the fuel tank is accessed via the opening part 44P by rotating and opening the cover member 52, which allows the fuel tank to be fueled.
  • In this specification, blocking the opening part 44P by rotating the cover member 52 is also referred to as "closing the opening part 44P". Moreover, exposing the opening part 44P by rotating the cover member 52 is also referred to as "opening (to open) the opening part 44P". An opening and closing mechanism 50 for opening and closing the opening part 44P is configured with the support part 51 and the cover member 52.
  • As described above, the hydraulic excavator 1 as a work machine of this embodiment comprises the machinery room 44 having the opening part 44P. In addition, the hydraulic excavator 1 further comprises the cover member 52 which opens and closes the opening part 44P, and the support part 51 which is attached to the machinery room 44 (via the bracket 53, for example) and rotatably supports the cover member 52.
  • Moreover, when the rotation range of the cover member 52 within which the opening part 44P is openable and closable is defined as a first rotation range Ra1 (see FIG. 5), the cover member 52 is rotated within the first rotation range Ra1 in a state where the support part 51 is attached to the machinery room 44. Meanwhile, the first rotation range Ra1 includes a first rotation position P1 and a second rotation position P2. The first rotation position P1 refers to a rotation position where the cover member 52 is rotated and closes the opening part 44P. The second rotation position P2 refers to a rotation position where the cover member 52 is maximally rotated within the rotatable range and opens the opening part 44P.
    • [2. Regarding a procedure for attaching and detaching the support part and the cover member]
  • FIG. 7-FIG. 9 are side views illustrating a procedure for attaching and detaching the support part 51 and the cover member 52. Meanwhile, in these figures, a solid arrow indicates a procedure for the removing direction of the cover member 52 from the support part 51, and a dashed arrow indicates a procedure for the attaching direction of the support part 51 and the cover member 52 to the machinery room 44. First, the procedure for the removing direction of the cover member 52 will be described.
  • In a state where the cover member 52 is in the first rotation position P1 in which the cover member 52 closes the opening part 44P, the fixation of the support part 51 with respect to the bracket 53 is disengaged. For example, the fixation can be disengaged by unfastening and separating a bolt and a nut which had been used for the fixation of the support part 51 with respect to the bracket 53. Then, the support part 51 and the cover member 52 are integrally moved upward as shown in FIG. 7. By so doing, the support part 51 and the cover member 52 are detached from the machinery room 44. Meanwhile, the rotation position of the cover member 52 with respect to the support part 51 at this moment is defined as a reference position P0. The posture (the rotation angle) of the cover member 52 with respect to the support part 51 in the reference position P0 is the same as the posture (the rotation angle) in which the cover member 52 is in the first rotation position P1 with respect to the support part 51 in a state where the support part 51 is attached to the machinery room 44.
  • Then, as shown in FIG. 8, the cover member 52 is rotated with respect to the support part 51 from the reference position P0 to an attachment and detachment rotation position Px. Here, the attachment and detachment rotation position Px refers to a rotation position of the cover member 52 which allows the attachment and detachment of the cover member 52 with respect to the support part 51. Meanwhile, at this time, the rotation direction of the cover member 52 from the reference position P0 toward the attachment and detachment rotation position Px is opposite to the rotation direction when the cover member 52 rotatably supported by the support part 51 is rotated from a state where the opening part 44P is closed to a state where the opening part 44P is opened, in a state where the the support part 51 is attached to the machinery room 44. When the cover member 52 reaches the attachment and detachment rotation position Px, the cover member 52 is detached from the support part 51 as shown in FIG. 9. Meanwhile, when the cover member 52 is in a rotation position other than the attachment and detachment rotation position Px, the cover member 52 cannot be structurally detached from the support part 51; however, its details will be described later.
  • On the other hand, when the support part 51 and the cover member 52 are attached to the machinery room 44, the opposite procedure to the above may be followed. That is to say, the cover member 52 is mounted to the support part 51 in the rotation position which takes the attachment and detachment rotation position Px (see FIG. 9). And the cover member 52 is rotated with respect to the support part 51 from the attachment and detachment rotation position Px to the reference position P0. Lastly, the support part 51 is fixed to the bracket 53 by using a bolt and the like (see FIG. 7). Thus, the attachment of the support part 51 and the cover member 52 to the machinery room 44 is completed.
    • [3. Details of the support part and the cover member]
  • Next, the structure of the support part 51 and the cover member 52 described above will be described in detail.
    • (3-1. Structure of the support part)
  • FIG. 10 is an enlarged perspective view of the support part 51. The support part 51 has a support body part 511 and a shaft part 512. The support body part 511 has a recess part 511a. The recess part 511a is formed in the front and center part of the support body part 511 in a rearward recessed manner. The shaft part 512 is arranged in the recess part 511a. In consideration of a reduction in weight and costs of materials, the inside of the support body part 511 and the shaft part 512 is formed with a hollow; however, it may be a solid structure which is full of contents.
  • The shaft part 512 is arranged in the center axis around which the cover member 52 is rotated. This makes it possible for the cover member 52 to rotate about the shaft part 512. In FIG. 10, given that the center axis around which the cover member 52 is rotated is defined as AX, the center axis AX passes through the shaft part 512 and extends in the left-right direction of the hydraulic excavator 1. Therefore, the shaft part 512 also extends in the left-right direction of the hydraulic excavator 1. In this embodiment, a pair of the shaft parts 512 (two shaft parts 512) is/are provided in the left-right direction and side by side. Respective shaft parts 512 are respectively supported by a left side surface 511aL and a right side surface 511 aR of the recess part 511 a in the support body part 511. Meanwhile, there may be only one shaft part 512.
  • FIG. 11 is a schematic cross-sectional view of the support part 51 when it is cut in a plane perpendicular to the shaft part 512 (the center axis AX). As shown in the same figure, the shaft part 512 has a shape which extends in one direction D1 in the cross section perpendicular to the center axis AX. That is, in the above-described cross section, assuming that a direction perpendicular to the one direction D1 is other direction D2, the maximum diameter of the shaft part 512 in the other direction D2 is a first shaft diameter A1 (mm), and the maximum diameter of the shaft part 512 in the one direction D1 is a second shaft diameter A2 (mm), A2 > A1 is fulfilled.
  • The shaft part 512 has a pair of arc parts 512a and a pair of straight line parts 512b in the above cross section. The pair of arc parts 512a faces each other in the one direction D1. The pair of arc parts 512a each bulges in a direction away from the center axis AX (the radial direction), and is formed in an arc-shaped manner. The pair of straight line parts 512b faces each other in the other direction D2. The pair of straight line parts 512b extends in the one direction D1, and is each coupled to the adjacent arc parts 512a.
  • In this embodiment, the one direction D1 is a forward, oblique and upward direction in the cross section, for example. Therefore, the pair of straight line parts 512b each extends forward, and obliquely and upward in the above cross section. Also, in the above cross section, of the pair of arc parts 512a, one arc part 512a is arranged in front of and above the other arc part 512a.
    • (3-2. Structure of the cover member)
  • FIG. 12 is an enlarged perspective view of a side of the cover member 52 attached to the support part 51. FIG. 13 is a cross-sectional view of the cover member 52. The cover member 52 has a cover body 521. When the cover body 521 is in a rotation posture which closes the opening part 44P, the cover body 521 has a shape which droops downward as the cover body 521 heads from the support side by the support part 51 toward the front (see FIG. 2). In consideration of a reduction in weight and costs of materials, the inside of the cover body 521 is formed with a hollow; however, it may be a solid structure which is full of contents.
  • The cover member 52 further has a shaft containing part 522 and a communication path 523. The shaft containing part 522 has a shape in which a cylinder is circumferentially partly cut out. The center axis of the cylinder extends in the left-right direction. The shaft containing part 522 contains the shaft part 512 of the support part 51 inside. The shaft containing part 522 is also a shaft receiving part which receives the shaft part 512 inside. The shaft containing part 522 is provided pairwise (two of them are provided) in the left-right direction in accordance with the two shaft parts 512 of the support part 51. Meanwhile, when there is only one shaft part 512, only one shaft containing part 522 may also be provided.
  • As shown in FIG. 12, a containing part support 524 is coupled to the rear of the cover body 521. The containing part support 524 has an outer peripheral wall 524a, an inner wall 524b, and an outer wall 524c. The outer peripheral wall 524a is arranged radially outside the two shaft containing part 522, and is coupled to the cover body 521. The inner wall 524b and the outer wall 524c are arranged vertically in the left-right direction, and are respectively coupled to the outer peripheral wall 524a.
  • The inner wall 524b and the outer wall 524c are provided in accordance with the number of the shaft containing part 522. In this embodiment, two of a pair of the inner wall 524b and the outer wall 524c are provided in the left-right direction. In the right pair, the outer wall 524c is arranged in the further right side than the inner wall 524b. In the left pair, the outer wall 524c is arranged in the further left side than the inner wall 524b.
  • The shaft containing part 522 has an inner peripheral surface 522a. The inner peripheral surface 522a is a surface that comes into contact with the outer peripheral surface of the shaft part 512 (for example, the arc part 512a) when the shaft part 512 is contained in the shaft containing part 522. The inner peripheral surface 522a extends in the left-right direction, and is supported by the inner wall 524b and the outer wall 524c of the containing part support 524. In a word, the shaft containing part 522 is supported by the containing part support 524. Further, as a result of the inner peripheral surface 522a being supported by the inner wall 524b and the outer wall 524c as mentioned above, the shaft containing part 522 has a shape which recesses from the outer wall 524c toward the inner wall 524b.
  • In order to contain the shaft part 512 in the shaft containing part 522, and relatively and smoothly rotate the cover member 52 with respect to the support part 51, rotating the shaft containing part 522 along the pair of arc parts 512a of the shaft part 512 is desired. From the viewpoint of realizing such rotation of the shaft containing part 522, it is desirable that the inner peripheral surface 522a has a shape along the pair of arc parts 512a of the shaft part 512. In order to allow the cover member 52 to be rotated in a state where the shaft part 512 is contained in the shaft containing part 522, the maximum inner diameter C (mm) of the inner peripheral surface 522a as shown in FIG. 13 is set at larger than or equal to the second shaft diameter A2 of the shaft part 512 (see FIG. 11).
  • The communication path 523 communicates with the shaft containing part 522. The communication path 523 is provided as a passage when the shaft part 512 of the support part 51 is inserted into and removed from the shaft containing part 522 of the cover member 52. Especially, the communication path 523 is coupled to an edge 522b (see FIG. 12) which is formed by circumferentially partly cutting out the cylindrical shaft containing part 522. The communication path 523 is supported by the inner wall 524b and the outer wall 524c of the containing part support 524, as in the shaft containing part 522.
  • As shown in FIG. 13, the width W (mm) of the communication path 523 is smaller than the maximum inner diameter C of the inner peripheral surface 522a. In addition, the width W of the communication path 523 is set in further consideration of the size of the shaft part 512 (the first shaft diameter A1 and the second shaft diameter A2). Specifically, in the cross section perpendicular to the center axis AX, the width W of the communication path 523 is larger than or equal to the first shaft diameter A1 of the shaft part 512 and is smaller than the second shaft diameter A2.
    • (3-3. Rotation position of the cover member with respect to the support part and their relative positional relationship)
  • In this embodiment, the shaft part 512 of the support part 51 is contained in the shaft containing part 522 of the cover member 52, which allows the cover member 52 to be rotated with respect to the support part 51 to any position of the first rotation position P1, the second rotation position P2, and the attachment and detachment rotation position Px as mentioned above. In the following, the relative positional relationship between the support part 51 and the cover member 52 in each of the first rotation position P1, the second rotation position P2 and the attachment and detachment rotation position Px will be described.
  • FIG. 14 is a cross-sectional view illustrating the positional relationship between the support part 51 and the cover member 52 when the cover member 52 is in the first rotation position P1 with respect to the support part 51 fixed to the machinery room 44. When the cover member 52 is in the first rotation position P1 within the first rotation range Ra1 (see FIG. 5), the communication path 523 of the cover member 52 faces a first direction Q1 in the cross section perpendicular to the center axis AX (the shaft part 512) which is the rotation center of the cover member 52. The first direction Q1 is downward, for example.
  • Moreover, in the above cross section, the first direction Q1 crosses the one direction D1 in which the shaft part 512 extends. For this reason, the width Ws of the shaft part 512 in the direction perpendicular to the first direction Q1 in the cross section is wider than the width W of the communication path 523. Therefore, the shaft part 512 cannot pass through the communication path 523 so that the shaft part 512 is not extracted from the shaft containing part 522 via the communication path 523. That is to say, the cover member 52 cannot be detached from the support part 51 and is supported in a rotatable manner with respect to the support part 51.
  • Meanwhile, the case where the support part 51 has been removed from the machinery room 44 can also be considered as in the case where the support part 51 has been attached to the machinery room 44. In short, when the cover member 52 is supported by the support part 51 which has been removed from the machinery room 44 in the same posture (at the same rotation angle) as in the case where the cover member 52 is in the first rotation position P1, the support part 51 and the cover member 52 come to a positional relationship as shown in FIG. 14, and thus the cover member 52 cannot be detached from the support part 51.
  • FIG. 15 is a cross-sectional view illustrating the positional relationship between the support part 51 and the cover member 52 when the cover member 52 is in the second rotation position P2 with respect to the support part 51 fixed to the machinery room 44. Meanwhile, the rotation angle in the second rotation position P2 of the cover member 52 with respect to the support part 51 is defined as Θ1 (°) with reference to the first rotation position P1. At this time, the rotation direction of the cover member 52 from the first rotation position P1 toward the second rotation position P2 is defined as a positive direction, and the opposite direction is defined as a negative direction.
  • When the cover member 52 is in the second rotation position P2 within the first rotation range Ra1, the communication path 523 of the cover member 52 faces a second direction Q2 in the cross section perpendicular to the center axis AX (the shaft part 512) which is the rotation center of the cover member 52. The second direction Q2 is a direction oblique to the front side with respect to the first direction Q1 (see FIG. 14).
  • Moreover, in the above cross section, the second direction Q2 crosses the one direction D1 in which the shaft part 512 extends. For this reason, the width Ws of the shaft part 512 in the direction perpendicular to the second direction Q2 in the above cross section is wider than the width W of the communication path 523. Therefore, the shaft part 512 cannot pass through the communication path 523 so that the shaft part 512 is not extracted from the shaft containing part 522 via the communication path 523. That is to say, the cover member 52 cannot be detached from the support part 51 and is supported in a rotatable manner with respect to the support part 51.
  • Meanwhile, the case where the support part 51 has been removed from the machinery room 44 can also be considered as in the case where the support part 51 has been attached to the machinery room 44. In short, when the cover member 52 is supported with respect to the support part 51 which has been removed from the machinery room 44 in the same posture (at the same rotation angle) as in the case where the cover member 52 is in the second rotation position P2, the support part 51 and the cover member 52 come to a positional relationship as shown in FIG. 15, and thus the cover member 52 cannot be detached from the support part 51.
  • FIG. 16 is a cross-sectional view illustrating the positional relationship between the support part 51 and the cover member 52 when the cover member 52 is in the attachment and detachment rotation position Px with respect to the support part 51. Meanwhile, the rotation angle of the cover member 52 with respect to the support part 51 in the attachment and detachment rotation position Px is defined as Θ2 (°) with reference to the first rotation position P1. However, θ2 is an angle whose direction is opposite to that of 01 (negative direction).
  • When the cover member 52 is in the attachment and detachment rotation position Px, the communication path 523 of the cover member 52 faces a third direction Q3 in the cross section perpendicular to the center axis AX (the shaft part 512) which is the rotation center of the cover member 52. The third direction Q3 is a direction oblique to the rear side with respect to the first direction Q1 (see FIG. 14).
  • Further, the third direction Q3 comes parallel to the one direction D1 in which the shaft part 512 extends. For this reason, the width Ws of the shaft part 512 in the direction perpendicular to the third direction Q3 in the above cross section comes equal to the first shaft diameter A1 of the shaft part 512 (see FIG. 11). As described above, because the width W of the communication path 523 is larger than or equal to the first shaft diameter A1, the shaft part 512 is allowed to pass through the communication path 523. Therefore, as shown in FIG. 17, the cover member 52 is relatively moved to a direction away from the support part 51 along the third direction Q3, thereby allowing the shaft part 512 to be relatively detached from the shaft containing part 522 via the communication path 523. In other words, the cover member 52 can be detached from the support part 51. Thus, the position of the communication path 523 which allows the shaft part 512 to pass through when the cover member 52 is rotated to the attachment and detachment rotation position Px with respect to the support part 51 is also referred to as a specific position PS (see FIG. 16).
  • Meanwhile, when the cover member 52 is mounted to the support part 51, what should be done is only to align the communication path 523 and the shaft part 512 in a state where the cover member 52 is inclined to the attachment and detachment rotation position Px against the support part 51 as shown in FIG. 17, and to move the cover member 52 in a direction approaching the support part 51 along the third direction Q3. In this case, the shaft containing part 522 results in relatively passing through the communication path 523 to be contained in the shaft containing part 522 (see FIG. 16). Subsequently, the cover member 52 is rotated to the first rotation position P1 and the support part is attached to the machinery room 44 so that mounting the support part and the cover member 52 to the machinery room 44 is completed.
  • FIG. 18 is an explanatory diagram together illustrating the first rotation position P1, the second rotation position P2 and the attachment and detachment rotation position Px of the cover member 52 with respect to the support part 51 described above. In a state where the support part is attached to the machinery room 44, when the cover member 52 is in the first rotation position P1 in which the cover member 52 closes the opening part 44P, the cover member 52 comes into contact with the upper part of the right hood 44R which constitutes the edge of the opening part 44P (see FIG. 2, etc.). Because of this, the cover member 52 cannot be rotated from the first rotation position P1 to the negative direction (the (-) side in FIG. 18). On the other hand, the cover member 52 can be rotated from the first rotation position P1 to the positive direction (the (+) side in FIG. 18) to reach the second rotation position P2 in which the cover member 52 opens the opening part 44P. Therefore, in the state where the support part 51 is attached to the machinery room 44, the cover member 52 can be rotated with respect to the support part 51 only within the first rotation range Ra1 in which the cover member 52 opens and closes the opening part 44P.
  • On the contrary, in a state where the support part 51 is removed from the machinery room 44, the rotation of the cover member 52 to the negative direction is not inhibited at all. Because of this, the cover member 52 can be rotated from the same posture as the first rotation position P1 to the negative direction to reach the attachment and detachment rotation position Px. Similarly, in the state where the support part 51 is removed from the machinery room 44, since the rotation of the cover member 52 to the positive direction is also not inhibited at all, the cover member 52 can be rotated from the same posture as the first rotation position P1 to the positive direction to take the same posture as the second rotation position P2, as a matter of course. Thus, in the state where the support part 51 is removed from the machinery room 44, the cover member 52 can be rotated within the range between the second rotation position P2 and the attachment and detachment rotation position Px.
  • Here, the rotation range between the second rotation position P2 and the attachment and detachment rotation position Px is also referred to as a second rotation range Ra2. From the same figure, it is seen that in the second rotation range Ra2, the first rotation range Ra1 (a range of 0°-θ1 in the rotation angle) is included in which the cover member 52 opens and closes the opening part 44P. Therefore, it can be said that in the state where the support part 51 is removed from the machinery room 44, the cover member 52 can be rotated with respect to the support part 51 within the second rotation range Ra2 which includes the first rotation range Ra1.
  • Moreover, the attachment and detachment rotation position Px described above is located in the negative direction with respect to the first rotation position P1, that is to say, in the rotation direction opposite to the second rotation position P2. Because of this, it can be said that the attachment and detachment rotation position Px is outside the first rotation range Ra1. Thus, it can be said that the above second rotation range Ra2 includes outside the first rotation range Ra1 the attachment and detachment rotation position Px in which the cover member 52 is attachable and detachable with respect to the support part 51.
  • As described above, by respectively defining the rotation range of the cover member 52 in the state where the support part 51 is attached to the machinery room 44 (the first rotation range Ra1), and the rotation range of the cover member 52 in the state where the support part 51 is removed from the machinery room 44 (the second rotation range Ra1), in the state where the support part 51 is attached to the machinery room 44, the cover member 52 is rotatably supported by the support part 51, and only in the state where the support part 51 is removed from the machinery room 44, the cover member 52 can be attached and detached with respect to the support part 51. Therefore, when the cover member 52 is rotatable with respect to the support part 51 and is supported by the support part 51 attachably and detachably with each other, use of an attachment member such as a hinge is unnecessary and a process for attaching such an attachment member to the cover member 52 and the support part 51 is also unnecessary. In other words, the opening and closing mechanism 50 for opening and closing the opening part 44P can be configured without the need of a dedicated part such as a hinge. Accordingly, with a simplified structure in which the support part 51 and the cover member 52 are combined, the opening and closing mechanism 50 is realized at low cost while the assembling ability of the opening and closing mechanism 50 can be improved. Moreover, by performing blow molding using a resin such as PP (polypropylene), for example, the support part 51 and the cover member 52 can be easily manufactured. Also in this regard, the opening and closing mechanism 50 can be realized inexpensively.
  • Also, in this embodiment, when the cover member 52 is rotated to the attachment and detachment rotation position Px in the second rotation range Ra2, the communication path 523 is arranged in the specific position PS in which the shaft part 512 can pass through (see FIG. 16). Therefore, when the cover member 52 is in the attachment and detachment rotation position Px, the shaft part 512 can be relatively inserted to and removed from the shaft containing part 522 via the communication path 523, which allows the cover member 52 to be attached and detached with respect to the support part 51.
  • When the cover member 52 is in the first rotation position P1, the communication path 523 faces the first direction Q1, when the cover member 52 is in the second rotation position P2, the communication path 523 faces the second direction Q2, and when the cover member 52 is rotated to the attachment and detachment rotation position Px, the communication path 523 faces the third direction Q3. Hence, when the communication path 523 faces a direction other than the third direction Q3 (for example, the first direction Q1 or the second direction Q2), the insertion and removal of the shaft part 512 via the communication path 523 is not allowed while the cover member 52 can be rotatably supported by the support part 51. On the other hand, when the communication path 523 faces the third direction Q3, the relative insertion and removal of the shaft part 512 with respect to the shaft containing part 522 via the communication path 523 is allowed, and the cover member 52 can be attached and detached with respect to the support part 51.
  • In particular, in the hydraulic excavator 1 in which the cover member 52 is rotated so as to open its front side with respect to the support part 51 to open and close the opening part 44P, in order to obtain the above-mentioned effects of this embodiment, setting the first direction Q1, the second direction Q2 and the third direction Q3 is desired at the following directions in the cross section perpendicular to the center axis AX. Namely, the first direction Q1 is downward. The second direction Q2 is a direction oblique to the front side with respect to the first direction Q1. The third direction Q3 is a direction oblique to the rear side with respect to the first direction Q1.
  • In the cross section perpendicular to the center axis AX, the width W of the communication path 523 is larger than or equal to the first shaft diameter A1 of the shaft part 512 and is smaller than the second shaft diameter A2. In such a setting of the width W, when the cover member 52 is rotated, and the communication path 523 faces the one direction D1 in which the shaft part 512 extends in the above cross section (= a direction of the second shaft diameter A2), the shaft part 512 is allowed to pass through the communication path 523 and to be relatively inserted and removed with respect to the shaft containing part 522 (see FIG. 16 and FIG. 17). On the other hand, in the rotation position of the cover member 52 in which the communication path 523 faces other direction than the one direction D1, due to the size relationship between the first shaft diameter A1, the second shaft diameter A2 and the width W of the communication path 523, the shaft part 512 cannot pass through the communication path 523, which does not allow the insertion and removal of the shaft part 512 with respect to the shaft containing part 522. In a word, only when the cover member 52 is rotated and reaches the rotation position in which communication path 523 faces the specific direction (the attachment and detachment rotation position Px), the attachment and detachment of the cover member 52 is allowed with respect to the support part 51.
  • The pair of straight line parts 512b of the shaft part 512 extends in the one direction D1 in the cross section perpendicular to the center axis Ax, and is each coupled to the adjacent arc parts 512a. In this configuration, by each defining the length of the pair of straight line parts 512b, the shaft part 512 having a cross-sectional shape in which the pair of straight line parts 512b extends in the one direction D1 is easily realized. Also, when the cover member 52 is rotated and reaches an orientation in which the communication path 523 is along the pair of straight line parts 512b (an orientation along the one direction D1), the shaft part 512 is allowed to pass through the communication path 523 and to be inserted and removed with respect to the shaft containing part 522.
  • In the attachment and detachment rotation position Px, in order to reliably realize, via the communication path 523, the relative insertion and removal of the shaft part 512 with respect to the shaft containing part 522 and the attachment and detachment of the cover member 52 with respect to the support part 51, the following structure is desired. That is to say, when the cover member 52 is rotated to the attachment and detachment rotation position Px (when the communication path 523 faces the third direction Q3), it is desired that the communication path 523 and the straight line parts 512b of the shaft part 512 are parallel. To that end, in the cross section perpendicular to the center axis AX, when the third direction Q3 is a direction oblique to the rear side with respect to the first direction Q1, it is desired that the straight line parts 512b extend forward, and obliquely and upward in the above cross section. Further, when the cover member 52 is in the attachment and detachment rotation position Px, it is desired that the straight line parts 512b extend along the third direction Q3 (see FIG. 16).
  • In the cross section perpendicular to the center axis AX, from the viewpoint of reliably realizing the shaft part 512 having a cross-sectional shape in which the straight line parts 512b extend forward, and obliquely and upward, it is desired that the pair of arc parts 512a of the shaft part 512 is arranged as follows. Namely, as shown in FIG. 11, it is desired that of the pair of arc parts 512a, one arc part 512a is arranged in front of and above the other arc part 512a.
  • When the cover member 52 is rotated to the attachment and detachment rotation position Px and the communication path 523 faces a direction along the straight line parts 512b of the shaft part 512 (the third direction Q3 = the one direction D1), from the viewpoint of reliably realizing the shaft part 512 being moved along the communication path 523, the following setting is desired. That is to say, in the cross section perpendicular to the center axis AX, it is desired that the width W of the communication path 523 is wider than the maximum width of the pair of straight line parts 512b in the opposing directions (the other direction D2). Meanwhile, as shown in FIG. 16, in the above cross section, the above maximum width is equal to the width Ws of the shaft part 512 in the direction perpendicular to the third direction Q3, and is also equal to the first shaft diameter A1 of the shaft part 512 (see FIG. 11).
    • [4. Another configuration of the hydraulic excavator]
  • FIG. 19 is a perspective view illustrating another configuration of the hydraulic excavator 1. The configuration of the support part 51 and the cover member 52 as shown in this embodiment, that is to say, the opening and closing mechanism 50 of the opening part 44P is certainly also applicable to the hydraulic excavator 1 having a cabin specification as shown in FIG. 19. The hydraulic excavator 1 in FIG. 19 has a configuration in which a cabin 47 is arranged in stead of the canopy 45 in FIG. 1. The cabin 47 has a door which is opened and closed when an operator gets on and off, and covers not only the upper part of the driver seat 41a, but also the front, rear, left and right perimeters of the driver seat 41a.
  • Also in the hydraulic excavator 1 in FIG. 19, the support part 51 which rotatably supports the cover member 52 is attached to the machinery room 44 via a bracket (not shown). In the hydraulic excavator 1 in FIG. 19, the support part 51 is formed with a transversely long shape in which the support part 51 extends in the left-right direction, and is arranged in the rear of the cabin 47 and in the rear of the cover member 52. In this way, also by applying the configuration of this embodiment to the transversely long support part 51, effects of this embodiment can be obtained.
    • [5. Supplement]
  • In this embodiment, the configuration has been explained in which the support part 51 has the shaft part 512, and the cover member 52 has the shaft containing part 522 and the communication path 523; however, this embodiment is not limited to this configuration. For example, such a configuration is acceptable that the support part 51 has the shaft containing part 522 and the communication path 523, and the cover member 52 has the shaft part 512. In short, such a configuration is sufficient that one of the support part 51 and the cover member 52 has the shaft part 512, and the other has the shaft containing part 522 and the communication path 523.
  • Parts arranged in the machinery room 44 and in the space between the seat mount 46 (or the driver seat 41a) and the right hood 44R is not limited to the fuel tank illustrated in this embodiment. For example, it is also possible to arrange, in the above space, parts such as a lead battery for suppling power to electrical equipment installed in the hydraulic excavator 1 (such as a monitor, a controller and illumination equipment), and a hydraulic oil tank for containing hydraulic oil. In this case, by rotating the cover member 52 to open the opening part 44P, the above parts can be accessed via the opening part 44P to perform maintenance such as replacement, inspection and replenishment.
  • In this embodiment, as the work machine, the hydraulic excavator 1 which is a construction machine has been taken as an example and explained; however, the work machine is not limited to the hydraulic excavator 1, and it may be another construction machine such as a wheel loader and a compact track loader. Further, the work machine may be an agricultural machine such as a combine and a tractor.
  • The hydraulic excavator 1 as the work machine has a configuration comprising the engine 40 (see FIG. 1) as a motor; however, the motor may be an electric motor.
  • The hydraulic excavator 1 as the work machine may have a configuration in which hydraulic equipment such as a hydraulic actuator (a hydraulic motor, a hydraulic cylinder, for example) and an actuator driven by electric power are used concurrently. Examples of the actuator driven by electric power include an electric travel motor, an electric cylinder, and an electric revolving motor.
    • [6. Supplementary Notes]
  • The work machine described in this embodiment can be expressed as follows.
  • A work machine according to supplementary note (1) is a work machine comprising a machinery room having an opening part, the work machine further comprising:
    • a cover member which opens and closes the opening part; and
    • a support part which is attached to the machinery room and rotatably supports the cover member,
    • wherein in a state where the support part is attached to the machinery room, the cover member is rotated with respect to the support part within a first rotation range within which the opening part is openable and closable, while in a state where the support part is removed from the machinery room, the cover member is rotated with respect to the support part within a second rotation range which includes the first rotation range, and
    • the second rotation range includes outside the first rotation range an attachment and detachment rotation position which allows attachment and detachment of the cover member with respect to the support part.
  • A work machine according to supplementary note (2) is the work machine according to supplementary note (1), wherein one of the support part and the cover member has
    • a shaft part which is arranged in a center axis around which the cover member is rotated,
    • the other of the support part and the cover member has
    • a shaft containing part which contains the shaft part, and
    • a communication path which communicates with the shaft containing part,
    • when the cover member is rotated with respect to the support part to the attachment and detachment rotation position in the second rotation range, the communication path is arranged in a specific position where the shaft part can pass through the communication path.
  • A work machine according to supplementary note (3) is the work machine according to supplementary note (2), wherein the communication path:
    • when the cover member is in a rotation position where the cover member closes the opening part within the first rotation range, faces a first direction in a cross section perpendicular to the center axis;
    • when the cover member is in a rotation position where the cover member opens the opening part within the first rotation range, faces a second direction oblique to the first direction in the cross section; and
    • when the cover member is rotated to the attachment and detachment rotation position within the second rotation range, faces a third direction oblique to a side opposite to a side in which the second direction is oblique to the first direction in the cross section.
  • A work machine according to supplementary note (4) is the work machine according to supplementary note (3), wherein the shaft part has a shape extending in one direction in the cross section perpendicular to the center axis, and
    • when a maximum diameter of the shaft part in the other direction perpendicular to the one direction in the cross section is defined as a first shaft diameter, and a maximum diameter of the shaft part in the one direction in the cross section is defined as a second shaft diameter,
    • a width of the communication path in the cross section is larger than or equal to the first shaft diameter and is less than the second shaft diameter.
  • A work machine according to supplementary note (5) is the work machine according to supplementary note (4), wherein the shaft part has, in the cross section:
    • a pair of arc parts which face each other in the one direction; and
    • a pair of straight line parts which face each other in the other direction, and
    • the pair of straight line parts extend in the one direction and are each coupled to the adjacent arc parts.
  • A work machine according to supplementary note (6) is the work machine according to supplementary note (5), wherein the shaft containing part has an inner peripheral surface along the pair of arc parts of the shaft part.
  • A work machine according to supplementary note (7) is the work machine according to supplementary note (5) or (6), wherein the first direction is downward,
    • the second direction is a direction oblique to a front side with respect to the first direction, and
    • the third direction is a direction oblique to a rear side with respect to the first direction.
  • A work machine according to supplementary note (8) is the work machine according to supplementary note (7), wherein the straight line parts extend forward, and obliquely and upward in the cross section.
  • A work machine according to supplementary note (9) is the work machine according to supplementary note (8) or (9), wherein of the pair of arc parts, one arc part is arranged in front of and above the other arc part.
  • A work machine according to supplementary note (10) is the work machine according to any one of supplementary notes (5) to (9), wherein when the cover member is in the attachment and detachment rotation position, the straight line parts extend along the third direction.
  • A work machine according to supplementary note (11) is the work machine according to any one of supplementary notes (5) to (10), wherein the width of the communication path is wider than the maximum width of the pair of straight line parts in opposing directions.
  • A work machine according to supplementary note (12) is the work machine according to any one of supplementary notes (2) to (11), wherein the support part has the shaft part, and
    the cover member has the shaft containing part and the communication path.
  • Although the embodiment of the present invention have been described above, the scope of the present invention is not limited thereto, and can be expanded or modified without departing from the spirit of the invention.
    • INDUSTRIAL APPLICABILITY
  • The present invention is available for a work machine such as a construction machine and an agricultural machine, for example.
    • REFERENCE SIGNS LIST
    • 1 hydraulic excavator (work machine)
    • 44 machinery room
    • 44P opening part
    • 51 support part
    • 52 cover member
    • 512 shaft part
    • 512a arc part
    • 512b straight line part
    • 522 shaft containing part
    • 522a inner peripheral surface
    • 523 communication path
    • A1 first shaft diameter
    • A2 second shaft diameter
    • AX center axis
    • D1 one direction
    • D2 other direction
    • P1 first rotation position
    • P2 second rotation position
    • PS specific position
    • Px attachment and detachment rotation position
    • Q1 first direction
    • Q2 second direction
    • Q3 third direction
    • Ra1 first rotation range
    • Ra2 second rotation range
    • W width of communication path

Claims (12)

  1. A work machine comprising a machinery room having an opening part, the work machine further comprising:
    a cover member which opens and closes the opening part; and
    a support part which is attached to the machinery room and rotatably supports the cover member,
    wherein in a state where the support part is attached to the machinery room, the cover member is rotated with respect to the support part within a first rotation range within which the opening part is openable and closable, while in a state where the support part is removed from the machinery room, the cover member is rotated with respect to the support part within a second rotation range which includes the first rotation range, and
    the second rotation range includes outside the first rotation range an attachment and detachment rotation position which allows attachment and detachment of the cover member with respect to the support part.
  2. The work machine according to claim 1, wherein one of the support part and the cover member has
    a shaft part which is arranged in a center axis around which the cover member is rotated,
    the other of the support part and the cover member has
    a shaft containing part which contains the shaft part, and
    a communication path which communicates with the shaft containing part,
    when the cover member is rotated with respect to the support part to the attachment and detachment rotation position in the second rotation range, the communication path is arranged in a specific position where the shaft part can pass through the communication path.
  3. The work machine according to claim 2, wherein the communication path:
    when the cover member is in a rotation position where the cover member closes the opening part within the first rotation range, faces a first direction in a cross section perpendicular to the center axis;
    when the cover member is in a rotation position where the cover member opens the opening part within the first rotation range, faces a second direction oblique to the first direction in the cross section; and
    when the cover member is rotated to the attachment and detachment rotation position within the second rotation range, faces a third direction oblique to a side opposite to a side in which the second direction is oblique to the first direction in the cross section.
  4. The work machine according to claim 3, wherein the shaft part has a shape extending in one direction in the cross section perpendicular to the center axis, and
    when a maximum diameter of the shaft part in the other direction perpendicular to the one direction in the cross section is defined as a first shaft diameter, and a maximum diameter of the shaft part in the one direction in the cross section is defined as a second shaft diameter,
    a width of the communication path in the cross section is larger than or equal to the first shaft diameter and is less than the second shaft diameter.
  5. The work machine according to claim 4, wherein the shaft part has, in the cross section:
    a pair of arc parts which face each other in the one direction; and
    a pair of straight line parts which face each other in the other direction, and
    the pair of straight line parts extend in the one direction and are each coupled to the adjacent arc parts.
  6. The work machine according to claim 5, wherein the shaft containing part has an inner peripheral surface along the pair of arc parts of the shaft part.
  7. The work machine according to claim 5 or 6, wherein the first direction is downward,
    the second direction is a direction oblique to a front side with respect to the first direction, and
    the third direction is a direction oblique to a rear side with respect to the first direction.
  8. The work machine according to claim 7, wherein the straight line parts extend forward, and obliquely and upward in the cross section.
  9. The work machine according to claim 8 or 9, wherein of the pair of arc parts, one arc part is arranged in front of and above the other arc part.
  10. The work machine according to any one of claims 5 to 9, wherein when the cover member is in the attachment and detachment rotation position, the straight line parts extend along the third direction.
  11. The work machine according to any one of claims 5 to 10, wherein the width of the communication path is wider than the maximum width of the pair of straight line parts in opposing directions.
  12. The work machine according to any one of claims 2 to 11, wherein the support part has the shaft part, and
    the cover member has the shaft containing part and the communication path.
EP24186190.5A 2024-07-03 2024-07-03 Work machine Pending EP4675052A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP24186190.5A EP4675052A1 (en) 2024-07-03 2024-07-03 Work machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP24186190.5A EP4675052A1 (en) 2024-07-03 2024-07-03 Work machine

Publications (1)

Publication Number Publication Date
EP4675052A1 true EP4675052A1 (en) 2026-01-07

Family

ID=91810199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24186190.5A Pending EP4675052A1 (en) 2024-07-03 2024-07-03 Work machine

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Country Link
EP (1) EP4675052A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001040703A (en) * 1999-07-30 2001-02-13 Komatsu Ltd Hydraulic excavator
US20090280971A1 (en) * 2008-05-09 2009-11-12 Mueller Martini Holding Ag Device for covering a machine in a production line comprising a plurality of machines
EP2107168B1 (en) 2008-03-31 2016-10-19 Kubota Corporation Upper assembly structure of work machine
US20230039973A1 (en) * 2021-08-05 2023-02-09 Takeuchi Mfg. Co., Ltd. Working vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001040703A (en) * 1999-07-30 2001-02-13 Komatsu Ltd Hydraulic excavator
EP2107168B1 (en) 2008-03-31 2016-10-19 Kubota Corporation Upper assembly structure of work machine
US20090280971A1 (en) * 2008-05-09 2009-11-12 Mueller Martini Holding Ag Device for covering a machine in a production line comprising a plurality of machines
US20230039973A1 (en) * 2021-08-05 2023-02-09 Takeuchi Mfg. Co., Ltd. Working vehicle

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