JP5981373B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle, and more particularly to a work vehicle that surrounds, by a cabin, a driving unit in which an engine room substantially covered with a seat mount cover is disposed under a driver's seat.

  There exists what was disclosed by patent document 1 as one form of a working vehicle. That is, Patent Document 1 discloses a structure in which an engine room is disposed in a seat mount cover (inner cover) that supports a driver's seat of a driver. As described above, the space under the driver's seat is used as an engine room, so that a useless space is reduced and the work vehicle can be downsized.

JP 2010-52679 A

  However, in Patent Document 1 described above, when the engine, peripheral devices, and the like in the engine room are maintained, the space for the driving unit is configured to be minimal as the work vehicle is downsized. It is not possible to secure a space for performing maintenance. Therefore, maintenance cannot be performed without removing the seat mount cover after removing the cabin, bonnet, and equipment around the seat mount cover, and the maintenance work is very complicated and requires a lot of labor. It was.

  Therefore, an object of the present invention is to provide a work vehicle that facilitates maintenance of an engine in an engine room and its peripheral devices.

  In order to achieve the above object, the present invention provides the following.

In the work vehicle according to the first aspect of the present invention, a seat mount cover on which a driver's seat is placed is disposed in a cabin that surrounds the driver, with the front upper portion of the engine room being casing, and after the cabin. A work vehicle in which a bonnet that casings a rear portion of the engine room is disposed adjacent to each other, and the left and right side end surfaces of the seat mount cover are formed with a part of the vertical surface substantially the same as the left and right side walls of the cabin. The left and right inspection doors that are exposed can be freely opened and closed, and each inspection door is opened to enable maintenance inside the engine room from the outside of the cabin .

  In such work vehicles, the opening and closing inspection doors that can maintain the equipment in the engine room from the outside of the cabin are arranged on the left and right sides of the seat mount cover, so that the components of the work vehicle such as the cabin can be removed. In addition, it is possible to easily perform maintenance and the like of the equipment disposed in the engine room from the outside of the cabin.

A work vehicle according to a second aspect of the present invention is the work vehicle according to the first aspect of the present invention, wherein the work vehicle is disposed in an upper front part of the engine room at an upper part of the engine or above the engine. The exhaust gas purifying device for purifying exhaust gas exhausted and the electrical components provided on the outer peripheral surface of the exhaust gas purifying device are arranged facing the left and right inspection doors in the left-right direction .

  In such a work vehicle, an exhaust gas purification device having a high maintenance frequency is arranged in the engine room, so that maintenance such as removal and replacement of filters and electrical parts of the exhaust gas purification device from the outside of the cabin becomes easy. Since the exhaust path from the engine to the exhaust gas purification device can be shortened, the efficiency of the exhaust gas purification device can be improved.

  According to the present invention, since the inspection door that can be opened and closed from the outside of the cabin is provided for the engine room under the driver's seat, the engine room can be removed without removing the components of the work vehicle such as the cabin. The equipment inside can be easily maintained.

The side view of the work vehicle which concerns on this invention. The perspective view of a driving part. The side view of a driving part. The top view of an operation part. The II sectional view taken on the line in FIG. 2 which shows the upper side of the inspection door. Side surface explanatory drawing which shows the state which opened the door for inspection of the left side. Side surface explanatory drawing which shows the state which opened the door for a right inspection. FIG. 3 is a perspective explanatory view showing a state in which an exhaust gas purification device is disposed in front of the engine.

  The gist of the present invention is that, in the work vehicle A that surrounds the operating portion 23 in which the engine room 45 substantially covered with the seat mount cover 31 is disposed under the driver seat 42 by the cabin 21, the cabin is provided on both the left and right sides of the seat mount cover 31. 21 is provided with openable and closable inspection doors 100L and 100R capable of maintaining the inside of the engine room 45 from the outside. That is, the structure of the seat mount cover 31 including the inspection door 100 that enables easy maintenance and the like in the engine room 45 from the outside of the cabin 21 without removing the components of the work vehicle A such as the cabin 21. It is related with the working vehicle A which has.

  Embodiments of the present invention will be described below with reference to the drawings. That is, A shown in FIG. 1 is a work vehicle according to the present invention, and the work vehicle A is an articulated wheel loader that performs excavation work or loading work such as earth and sand.

[Overview of overall work vehicle]
As shown in FIG. 1, the work vehicle A pivots the rear end portion of the front frame 1 of the front portion A1 and the front end portion of the rear frame 2 of the rear portion A2 by a pivot shaft 3 whose axis is directed in the vertical direction. The front part A1 and the rear part A2 are bent in a "<" shape in a plan view around the pivot shaft 3 so as to be articulated. In other words, the work vehicle A is configured to be able to make a quick turn by appropriately turning the vehicle body into a half-folded state.

  The front frame 1 is supported by a pair of left and right front wheels 4 and 4 and is equipped with a loader 5. The loader 5 is attached to the upper ends of a pair of left and right arm columns 6 and 6 formed by standing up from the front frame 1 so that the base ends of the pair of left and right lift arms 7 and 7 can be pivoted up and down respectively. A bucket 8 is attached to the front end portions of 7 and 7 so as to be horizontal and rotatable up and down. Lift arm cylinders 9 and 9 are interposed between the middle parts of the lift arms 7 and 7 and the middle parts of the arm columns 6 and 6, respectively. A bell crank 11 extending in the vertical direction is attached to a bell crank support piece 10 interposed between the middle portions of the lift arms 7 and 7 so as to be swingable back and forth. A cylinder support piece 12 protrudes from the front frame 1 toward the front upper side between the arm struts 6 and 6, and a bucket cylinder is provided between the tip of the cylinder support piece 12 and the upper end of the bell crank 11. On the other hand, an interlocking link 14 is interposed between the lower end portion of the bell crank 11 and the bucket 8.

  The rear frame 2 is supported by a pair of left and right rear wheels 20 and 20, and a cabin 21 and a bonnet 22 are mounted on the rear frame 2 adjacent to each other in the front-rear direction.

  The cabin 21 is formed in a box shape surrounding the operation unit 23. That is, the cabin 21 is formed of front and rear walls 24, 25, left and right side walls 26, 26, and a ceiling portion 27. A windshield 28 is stretched on the upper half of the front wall 24, and the left side wall 26 is A part is formed by an opening / closing opening 29 that can be freely opened and closed.

  As shown in FIGS. 2 to 4, the operating unit 23 forms a front half by stretching a horizontal floor 30 on the rear frame 2, and a stepped convex seat mount cover 31 is provided. And the latter half is formed. A cylindrical steering column 32 extending in the vertical direction is erected on the front portion of the floor portion 30. On the upper surface of the steering column 32, a cold / warm air distribution case 33 and an instrument panel 34 are disposed adjacent to each other in the front-rear direction to close the upper surface of the steering column 32. The rear wall 35 of the steering column 32 is inclined with a low front and rear height, while the instrument panel 34 is inclined with a low front and rear height. A steering shaft 36 extending vertically is disposed in the rear part of the steering column 32 along the rear wall 35 of the steering column 32 and is inclined upward from the rear part of the instrument panel 34. A steering handle 37 as a steering operation tool is attached to the upper end portion of the steering shaft 36. Reference numeral 38 denotes an operation pedal group 38 disposed on the floor 30 immediately after the steering column 32.

  The seat mount cover 31 that forms the rear half of the driver 23 has a driver seat 42 on the upper surface 41, a work implement lever 43 and an option lever 44 on the right side of the driver seat 42, and an upper portion of the engine room 45. Casing. In addition, left and right inspection doors 100L and 100R which are exposed to the outside and form a part of the vertical surface substantially the same as the left and right side walls 26 and 26 of the cabin 21 are disposed on the left and right end surfaces of the seat mount cover 31. Yes. The upper edge of the inspection door 100 is pivotally connected to the left and right edge portions of the upper surface 41 of the seat mount cover 31 by a hinge structure 104, which will be described later, so that the inspection door 100 can be freely opened and closed in the vertical direction. . In addition, 48 is a footrest and 49 is a rear fender.

  In the upper part of the engine room 45, an exhaust gas purifying device that purifies exhaust gas exhausted from the upper part of a diesel engine 46 (hereinafter referred to as an engine) which is a kind of engine mounted on the rear part of the rear frame 2 or the engine 46. 47 is arranged.

  A partition wall 50 is disposed on the rear frame 2 located behind the seat mount cover 31, and the rear surface (rear surface) of the seat mount cover 31 is closed by the partition wall 50, and the upper half portion of the partition wall 50 is closed. The seat mount cover 31 is formed so as to extend rearwardly and upwardly from the upper surface portion 41 of the seat mount cover 31. The upper end edge of the partition wall 50 is pivotally connected to the upper portion of the front edge of the bonnet 22 so that the bonnet 22 can be opened and closed freely in the vertical direction around the pivot connection (not shown). An ECU (engine control unit) (not shown) or the like is attached to the upper half of the rear surface of the partition wall 50 and is covered with the bonnet 22.

  In the work vehicle A configured as described above, in the present embodiment, the left and right inspection doors 100L and 100R are disposed on the left and right side end surfaces of the seat mount cover 31, and the engine room 45 is disposed from the outside of the work vehicle A. It is possible to perform maintenance of each part arranged on the top of the. In addition, an exhaust gas purification device 47 having a high maintenance frequency is disposed in front of the engine 46 so as to be integrated with the engine 46 so that the exhaust gas purification device 47 can be easily maintained.

  Hereinafter, the structure of the inspection door 100 and the arrangement of the exhaust gas purifying device 47 will be described in detail with a focus on the structure of the seat mount cover 31.

[Explanation of the peripheral structure of the inspection door and the arrangement of the exhaust gas purifier]
As shown in FIG. 1, a cabin 21 surrounding the driving unit 23 is disposed in the driving unit 23. As shown in FIGS. 2 to 4, the seat mount cover 31 is disposed in a state in which the engine room 45 is casing, and the driver's seat 42 is mounted on the center of the seat mount cover 31. .

  The seat mount cover 31 is made of sheet metal and has a substantially box-like engine room casing function. The seat mount cover 31 has a substantially rectangular plate-like front wall surface portion 40 formed so as to rise upward from the floor portion 30, and a substantially rectangular shape formed by horizontally extending backward from the upper edge of the front wall surface portion 40. The left and right room opening ports 101L and 101R are formed from a plate-shaped upper surface portion 41, and the room opening ports 101L and 101R are opened and closed freely by the left and right inspection doors 100L and 100R. doing. The structure of the inspection door 100 will be described later.

  Further, the seat mount cover 31 is formed to have substantially the same width as the left and right width of the floor portion 30. Thus, since the seat mount cover 31 is formed by extending in the left-right direction, it is necessary to prevent the strength of the seat mount cover 31 from being lowered. Therefore, the reinforcement frames 102 and 102 are formed inside the seat mount cover 31 and in contact with the back surface of the front wall surface portion 40 and the back surface of the upper surface portion 41 in the vicinity of the left and right room opening ports 101L and 101R. doing. The reinforcing frame 102 is formed of a square pipe that is substantially L-shaped when viewed from the side, and has a vertical end connected to the floor 30 and a horizontal end connected to the partition wall 50. The reinforcing frame 102 can provide sufficient strength against external forces from the front, upper, and left and right sides of the seat mount cover 31.

  The rear lower end portions of the left and right side walls 26, 26 of the cabin 21 are formed in a concave shape along the front wall surface portion 40 of the seat mount cover 31 that forms a part of the operating portion 23 and the left and right side edges of the upper surface portion 41. The cabin 21 surrounds the front and upper surfaces of the seat mount cover 31 that forms a part of the operating unit 23, and the left and right inspection doors 100 </ b> L and 100 </ b> R are exposed from the cabin 21 to the left and right sides. That is, the left and right inspection doors 100L and 100R can be opened and closed from the outside of the work vehicle A.

  A driver's seat 42 is disposed on the seat mount cover 31 so as to be located immediately behind the steering handle 37. Specifically, since the seat mount cover 31 is substantially flat, it is not necessary to separately provide a special support base for supporting the driver's seat 42, and the driver's seat 42 can be placed and fixed as it is. The engine room 45 and the operating unit 23 can be connected with each other in such a simple structure.

  A driver seat mounting bracket (not shown) is connected to the bottom of the seat surface of the driver seat 42, and the bracket is fixed to the upper surface of the seat mount cover 31 with bolts (not shown). Accordingly, the driver's seat 42 is fixed.

  A lever support case 110 is disposed on the right side of the driver seat 42 on the seat mount cover 31. Two levers 43 and 44 are disposed on the upper surface of the lever support case 110. The work machine lever 43 is provided on the side close to the driver's seat 42, and the outer side thereof is shorter than the work machine lever 43. The lever 44 protrudes. The work implement lever 43 can be tilted in the front / rear and left / right directions. The work implement lever 43 is hydraulically connected to the lift arm cylinders 9 and 9 of the lift arms 7 and 7 via a lift arm control valve (not shown). The lift arms 7 and 7 can be moved up and down by interlocking the expansion and contraction operation of the lift arm cylinders 9 and 9 with the tilting operation of the work machine lever 43 in the front-rear direction. Further, the bucket cylinder 13 of the bucket 8 is hydraulically connected to the work implement lever 43 via a bucket control valve (not shown), and the expansion and contraction operation of the bucket cylinder 13 is linked to the tilting operation of the work implement lever 43 in the left-right direction. Thus, the bucket 8 can be turned up and down. The option lever 44 is for performing hydraulic control when an option arm (not shown) having a function different from that of the bucket 8 such as a gripping arm (not shown) is attached instead of the bucket 8. The option lever 44 can be tilted in the front-rear direction, and an option arm operating cylinder (not shown) of the option arm is hydraulically connected to the option lever 44 via an option arm control valve (not shown). The option arm can be operated by interlocking the expansion / contraction operation of the option arm operation cylinder (not shown) with the tilting operation of 44 in the front-rear direction. The levers 43 and 44 include a first work machine lever link mechanism 120, a second work machine lever link mechanism 121, and an option lever link mechanism 122 corresponding to the respective mechanisms inside the seat mount cover 31. .

  The lower part of the seat mount cover 31 forms the upper part of the engine room 45. In the upper part of the engine room 45, as shown in FIG. 6 and FIG. The drive system equipment and the link mechanisms 120, 121, 122 of the work machine lever 43 and the option lever 44 are accommodated. That is, an engine 46 is disposed in a substantially central portion of the engine room 45, an exhaust gas purifying device 47 is disposed substantially below the driver seat 42, which is in front of the engine room 45, and each link mechanism 120, 121, 122 is disposed on the right side. Has been established.

  As described above, the left and right room opening ports 101L and 101R are provided on the left and right end surfaces of the seat mount cover 31 surrounding the upper portion of the engine room 45, respectively. The room opening 101 is a substantially rectangular opening in a side view with the longitudinal direction being the front-rear direction, and the inside of the upper part of the engine room 45 can be seen through from the left and right room opening 101L, 101R. Therefore, from the room opening 101, it is possible to inspect equipment on the left and right sides of the engine 46 in the engine room 45.

  Specifically, as shown in FIG. 6, a part of the engine 46 and the exhaust gas purifying device 47 can be visually recognized from the left room opening 101L, and the engine is seen from the right room opening 101R as shown in FIG. Since part of 46 and each link mechanism 120, 121, 122 can be visually recognized, these can be maintained easily.

  In addition, the engine equipment and the like disposed on the left and right sides above the engine 46 are not easily accessible even when the rear bonnet 22 is opened, and it is difficult to visually check in a dark place. In the present embodiment, it is possible to easily check the engine related equipment gathered at the front left and right portions of the engine room 45 from the left and right room opening ports 101L and 101R.

  Here, the schematic structure and arrangement of the exhaust gas purification device 47 will be described with reference to FIG. The exhaust gas purification device 47 is an exhaust gas purification device that purifies exhaust gas discharged from the diesel engine 46. Therefore, the exhaust gas purification device 47 is inserted in the exhaust path of the engine 46.

In the exhaust gas purification device 47, the mounting flange 132 side that also serves as an inlet for exhaust gas discharged from the engine 46 is defined as the upstream side. Further, in the exhaust gas purification device 47, a diesel oxidation catalyst 133 is arranged in series on the upstream side, and a soot filter 134 is arranged in series on the downstream side. Diesel oxidation catalyst 133, NOx in the exhaust gas is oxidized to generate NO _2, to promote the re-combustion of the particulate matter such as soot trapped in the soot filter 134 by the oxidation action of NO _2. The soot filter 134 is configured to capture particulate matter such as soot in the exhaust gas. Therefore, the exhaust gas purification device 47 maintains the exhaust gas temperature exhausted from the engine 46 at a high temperature, and further prevents the engine 46 exhaust gas from being exhausted as much as possible so as not to reduce the flow velocity in the exhaust path. It is desirable to arrange it immediately after the manifold 130. The exhaust gas purification device 47 has three temperature sensors, an upstream temperature sensor 135, a middle temperature sensor 136, and a downstream temperature sensor 137, and an upstream differential pressure sensor 138 and a downstream differential pressure sensor 139, which are electrical components. Two differential pressure sensors are detachably provided.

  However, if the structure of the seat mount cover cannot be maintained in the upper part of the engine room 45 unless the seat mount cover or the like is removed as in the prior art, the filters 133 and 134 for the exhaust gas purifying apparatus 47 having a high maintenance frequency are used. Is required to perform maintenance such as removing and replacing the electric parts 135, 136, 137, 138, and 139, so that the exhaust gas purifying device 47 is integrated with the engine 46. There has been concern about disposing it above the engine 46. For this reason, the exhaust gas purification device 47 must be disposed at a location away from the engine 46, such as in the vicinity of the bonnet 22 where maintenance is easy, and the efficiency of the exhaust gas purification device 47 is reduced.

  In the present invention, the left and right room opening ports 101L and 101R are provided on the left and right end faces of the seat mount cover 31 as described above, so that the cabin 21 and the bonnet 22 and the devices around the seat mount cover 31 and the seat mount cover are provided. 31 without removing the engine 31 from the outside of the work vehicle A to the front left and right sides of the engine room 45, and removal and replacement of the filters 133 and 134 of the exhaust gas purification device 47, and electrical components 135, 136, and 137. , 138, 139 can be easily maintained and inspected such as removal and replacement.

  Thus, in the work vehicle A according to the present embodiment, the exhaust gas purification device 47 can be disposed above the engine 46. Specifically, it is possible to directly connect the mounting flange 132 serving as the inlet of the exhaust gas purification device 47 to the mounting flange 131 of the exhaust manifold 130 for exhausting the exhaust gas of the engine 46. The device 47 can be arranged so as to be integral with the engine 46. The exhaust gas purification device 47 is attached to a mounting surface (not shown) formed on the upper surface of the flywheel housing 141 by a mounting flange (not shown) and a bolt formed on the exhaust gas purification device 47. Fastened and fixed. The purified exhaust gas that has passed through the filters 133 and 134 of the exhaust gas purification device 47 is discharged to the outside through an exhaust muffler 140 from an exhaust port (not shown) formed on the side opposite to the mounting flange 132. Is done.

  As described above, by providing the left and right room opening ports 101L and 101R on the left and right end surfaces of the seat mount cover 31, the exhaust gas purification device 47 can be easily maintained, and the engine 46 It is possible to employ a configuration in which the exhaust gas purification device 47 is disposed above the exhaust gas purification device 47, and the exhaust gas purification efficiency of the exhaust gas purification device 47 can be greatly improved.

  In addition, about the arrangement | positioning location of the exhaust gas purification apparatus 47 with respect to the engine 46 mentioned above, it is not limited to this embodiment, If the exhaust gas purification apparatus 47 can be visually recognized from the room opening 101, and maintenance is possible, The exhaust gas purifying device 47 may be disposed at any location of the engine 46, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims.

  Next, the inspection door 100 that allows the room opening 101 to be opened and closed will be described with reference to FIGS. Left and right inspection doors 100 </ b> L and 100 </ b> R having a substantially rectangular shape when viewed from the side are provided on the left and right end surfaces of the seat mount cover 31 so as to close the room opening 101.

  The inspection door 100 is pivotally attached to the upper edge of the inspection door 100 and the left and right side edges of the upper surface portion 41 of the seat mount cover 31 by a hinge structure 104. Specifically, immediately below the rear side of the left and right side edges of the upper surface portion 41, the door pivot shaft 103 whose axial direction is the longitudinal direction is supported over the substantially entire length of the left and right side edges, and the door pivot is supported. The insertion hole 109 is formed by bending the upper edge of the inspection door 100 inward over the entire length so that the shaft 103 can be inserted. Therefore, by inserting the door pivot shaft 103 into the insertion hole 109, the hinge structure 104 is configured to open and close the inspection door 100 up and down with respect to the room opening 101. Note that both ends of the door pivot shaft 103 are fixed to each other by forming bearings (not shown) in the corresponding portions of the seat mount cover 31.

  In addition, the method for opening and closing the inspection door 100 described above is not limited to the present embodiment. For example, the inspection door 100 can be opened and closed to the left and right, the inspection door 100 is detachable, etc. Various modifications and changes can be made within the scope of the gist of the present invention described in the claims.

  2, 6, and 7, three bolt holes 105 are formed near the lower end of the inspection door 100, and nuts 106 corresponding to the bolt holes 105, 105, 105 are provided. A welded bracket 107 is formed on the rear frame 2 side. Therefore, the inspection door 100 is fixed by fastening with the three bolts 108 from the outside of the work vehicle A.

  As described above, in work vehicle A according to the present embodiment, openable and closable inspection doors 100L and 100R that can maintain the inside of engine room 45 from the outside of cabin 21 are arranged on the left and right sides of seat mount cover 31. Thus, maintenance of the equipment disposed in the engine room 45 from the outside of the cabin 21 can be easily performed without removing the components and the like of the work vehicle A such as the cabin 21.

  Further, since the exhaust gas purification device 47 having a high maintenance frequency is disposed in the engine room 45, the filters 133 and 134 and the electrical components 135, 136, 137, and 138 of the exhaust gas purification device 47 are provided from the outside of the cabin 21. , 139 etc. can be easily removed and replaced, and the exhaust path from the engine 46 to the exhaust gas purification device 47 can be shortened, so that the efficiency of the exhaust gas purification device 47 can be improved. .

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

A Work vehicle 21 Cabin 23 Driving unit 31 Seat mount cover 42 Driver's seat 45 Engine room 47 Exhaust gas purification device 100 Inspection door

Claims (2)

A seat mount cover on which the driver's seat is placed is placed in the cabin surrounding the driver's seat so that the front upper part of the engine room is casing. A bonnet that casings the rear part of the engine compartment is adjacent to the cabin. A work vehicle arranged with
Left and right inspection doors that are part of the same vertical plane as the left and right side walls of the cabin are formed on the left and right side end faces of the seat mount cover so that they can be opened and closed. A work vehicle characterized in that the inside of the engine room can be maintained from outside the cabin by opening . In the front upper part of the engine room, an exhaust gas purification device that is disposed above the engine and is disposed above the engine to purify exhaust gas exhausted from the engine, and electrical components provided on the outer peripheral surface of the exhaust gas purification device The work vehicle according to claim 1, wherein the work vehicle is disposed so as to face the left / right inspection door in the left-right direction .

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