JP2006240485A - Door opening/closing structure of working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and visually check the position of a working device with respect to an object from an entrance of a cabin. <P>SOLUTION: In a door opening/closing structure of a working vehicle having a sliding door 49 which is slidable between the forward closing position to close an entrance 40 formed in a transverse side part of a cabin 9 to cover a boarding operation unit 8 and the rear full-opened position to largely open the entrance 40, a front part side of the sliding door 49 is supported by a pair of upper and lower rocking arms 67, 69 which are longitudinally rocked, and a rear part side of the sliding door 49 is supported by a sliding member 71 to slide along a guide rail 72 in the longitudinal direction. A front end of the sliding door 49 depicts an arc-shaped track K1, and a rear end of the sliding door 49 depicts a straight track K2 when the sliding door 49 is opened/closed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a door opening / closing structure for a work vehicle including a sliding door that opens and closes a doorway formed on a lateral side portion of a cabin that covers a boarding operation portion by sliding in the front-rear direction.

As a door opening / closing structure for a work vehicle as described above, there is one in which a sliding door is configured to slide in the front-rear direction along the lateral side surface of a cabin (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2004-222639

  For example, in a backhoe which is an example of a work vehicle, there is a case where a side groove forming operation is performed in which a groove along the front-rear direction of the airframe is formed in a front lateral side portion on the cabin entrance side in the airframe. In order to increase the working accuracy, it is necessary to position the bucket at an appropriate position on the front lateral side portion. In addition, in a combine that is an example of a work vehicle, there is a case where a dredging operation is carried out in which the planted grain is harvested along the dredging on the cabin entrance side, and in such a case, contact with the dredging is avoided. For this purpose, it is necessary to place a divider or the like disposed at the cabin entrance / exit side end of the cutting and conveying apparatus at an appropriate position with respect to the kite.

  And when these necessity is high, it will be necessary for a driver | operator to visually grasp | ascertain the positional relationship of the bucket with respect to a groove formation location, and the positional relationship of a divider with respect to a cage | basket, etc., but the conventional door mentioned above In the opening / closing structure, in order to visually check the opening / closing structure, the sliding door of the cabin is slid to the fully opened position and held in the fully opened position, and then the face or the like can be seen from the fully opened entrance.

  In other words, in the conventional door opening and closing structure, the driver slides the cabin sliding door to the fully open position so that the driver can visually confirm the positional relationship of the working device with respect to the object on the entrance / exit side from the entrance / exit of the cabin. Therefore, since it is necessary to hold in the fully open position, the visual confirmation is troublesome.

An object of the present invention is to make it easy to confirm the position of a working device or the like with respect to an object visually observed from a cabin entrance.

  In the invention according to claim 1 of the present invention, a front closed position that closes the entrance / exit formed on the lateral side portion of the cabin that covers the boarding operation part, and a rear fully open position that greatly opens the entrance / exit In a door opening / closing structure of a work vehicle provided with a slide door configured to be slidable over a range, the front side of the slide door is supported by a pair of upper and lower swing arms swinging back and forth, and the rear side of the slide door is supported Supported by a sliding member that slides along a front and rear guide rail, when the sliding door is opened and closed, the front end of the sliding door draws an arcuate track, and the rear end of the sliding door draws a linear track It is constituted as follows.

  According to this configuration, when the sliding door is slid to, for example, a half-open position in the middle of opening and closing thereof, the front end side is separated from the cabin entrance and exit sideways, and between the cabin entrance and exit. A forward-facing opening will be formed, and the visibility with respect to the laterally outer front on the entrance / exit side of the airframe will be improved.

  In other words, for example, in a backhoe that is an example of a work vehicle, when performing a side groove forming operation that forms a groove along the front-rear direction of the fuselage at the front lateral side location on the cabin entrance side of the fuselage, the slide door is opened and closed For example, when sliding to a half-open position, the positional relationship between the front lateral side of the fuselage forming the side groove and the bucket is easy from the forward opening formed between the cabin entrance and slide door. And the bucket can be easily positioned at an appropriate position with respect to the front lateral side portion.

  Further, for example, in a combine that is an example of a work vehicle, a coasting operation for harvesting planted cereals along the cab on the cabin entrance and a divider on the cabin entrance in the harvesting conveyance unit at the shoreline. For example, when the sliding door is slid to, for example, a half-open position during opening and closing, a forward opening formed between the cabin entrance and the sliding door is performed. Therefore, it is possible to easily grasp the positional relationship between the cocoons and planted cereals and the dividers arranged on the cabin entrance of the harvesting and transporting device. Can be easily positioned.

  Therefore, even if the sliding door is not slid to the fully open position, a forward opening can be formed between the cabin entrance and the sliding door only by sliding to the half open position, for example, during opening and closing, The positional relationship of the work device or the like with respect to the object on the entrance / exit side can be easily visually confirmed from the forward opening, and as a result, the workability in the work that requires the situation determination on the entrance / exit side can be improved.

  According to a second aspect of the present invention, in the invention according to the first aspect, the holding mechanism holds the slide door in a half-open position that is spaced laterally outward from the entrance / exit toward the front end side. Is provided.

  According to this configuration, when the sliding door is slid to the half-open position, the sliding door is held at the half-open position, and a state in which a forward opening is formed between the cabin entrance and exit is maintained. Without requiring labor to hold the door in the half-open position, it is possible to easily grasp the positional relationship of the work device or the like with respect to the object on the entrance / exit side from the forward opening.

  Therefore, it is possible to eliminate the labor required to hold the sliding door in the half-open position, which is necessary for grasping the positional relationship of the work device or the like with respect to the object on the entrance / exit side. Therefore, it is possible to further improve the workability in the work that needs to be performed.

  According to a third aspect of the present invention, in the invention according to the second aspect, the holding mechanism is configured by a detent mechanism interposed between the guide rail and the sliding member. It is.

  According to this configuration, for example, the sliding member includes a ball that is projected and biased toward the guide rail by a push spring, and a simple configuration in which the concave portion into which the ball is engaged is formed in the guide rail. It is possible to maintain the position of the sliding door in the half-open position.

  By simply sliding the slide door to the half-open position, the slide door can be easily held in the half-open position by the bias of the push spring, and the slide door sliding operation against the bias of the push spring is possible. Thus, the sliding door can be easily slid from the half-open position to the fully open position or the closed position.

  Therefore, the operability of the sliding door can be improved while simplifying the configuration as the holding mechanism.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a boarding step in which a rocking fulcrum of the rocking arm is laid on the boarding operation unit. It is provided in the rear position.

  According to this configuration, for example, the extension length from the swing support point of the swing arm to the support position of the slide door is longer than that in the case where the swing support point of the swing arm is arranged on the lateral side of the boarding step. The travel distance from the closed position of the slide door to the opening direction can be lengthened accordingly, and as a result, the opening amount of the entrance / exit in the fully opened state where the slide door is located at the fully opened position is increased. Can be secured.

  Therefore, it becomes easy to get on and off from the cabin entrance.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the swing arm is configured to have a swing fulcrum at the fully open position of the slide door. The frame is bent so as to bypass the frame standing on the laterally outward side and extend backward.

  When the swing arm is formed in a straight line, when the frame is erected laterally outward of the swing support point of the swing arm, the swing arm is swung toward the rear, which is the opening direction of the slide door. The backward swing is restricted by the frame, and the moving distance in the opening direction from the closed position of the slide door is shortened.

  On the other hand, in the invention according to the fifth aspect, even when the frame is erected laterally outside the swing fulcrum of the swing arm, the swing arm can be moved backward by the frame. The movement is not restricted, and this makes it possible to lengthen the moving distance from the closed position of the sliding door to the opening direction. As a result, the opening of the entrance / exit in the fully opened state where the sliding door is located at the fully opened position Large amount can be secured.

  Therefore, even when the frame is erected laterally outside the swing fulcrum of the swing arm, it is easy to get on and off from the cabin entrance.

  In the invention according to claim 6 of the present invention, in the invention according to any one of claims 1 to 5, the working position for projecting the auxiliary step for getting on and off toward the laterally outer side of the fuselage. And a retracted position retracted to the machine body so that the position can be switched, the auxiliary step is switched to the retracted position in conjunction with the sliding of the slide door to the closed position, and the slide door is fully opened. An interlocking mechanism for switching the auxiliary step to the operating position in conjunction with sliding to a position is provided.

  According to this configuration, it is possible to easily get on and off from the entrance by switching the auxiliary step to the operation position when getting on and off when the sliding door is located at the fully open position without requiring labor for the position switching operation of the auxiliary step. During traveling with the slide door positioned at the closed position, the auxiliary step is switched to the retracted position and the amount of protrusion from the machine body is reduced, thereby preventing contact with other objects.

  Therefore, it is possible to improve the boarding / exiting ability from the entrance / exit while omitting the labor required for the position switching operation of the auxiliary step, and it is possible to suppress the damage caused by the contact of the auxiliary step with other objects.

  FIG. 1 shows the entire side surface of the combine, and FIG. 2 shows the entire plane. This combine is equipped with a pair of left and right crawler type traveling devices 2 at the lower part of a body frame 1 formed of pipe material or the like. Then, the cutting and conveying part 3 is connected to the front part of the machine body frame 1 so as to be able to swing up and down, the threshing device 4 is mounted on the left half part of the machine body frame 1, and the waste straw processing part 5 is installed at the rear part of the threshing device 4. Connected, the grain tank 6 is mounted on the right rear part of the machine body frame 1, the grain tank 6 is equipped with a screw conveying type grain discharging device 7, and the boarding operation part 8 is formed on the right front part of the machine body frame 1. In addition, a cabin 9 that covers the boarding operation unit 8 is provided.

  The left and right crawler type traveling devices 2 show a straight traveling state by their constant speed drive and a turning state by their differential.

  The cutting and conveying unit 3 causes a predetermined number of planted cereals to be harvested by weeding with a plurality of dividers 10 and a plurality of pulling devices 11 as the aircraft travels, and the stock side Is cut with a clipper-type cutting device 12 and the cut cereal after cutting is transported toward the rear threshing device 4 while the posture is changed from the standing posture to the lying-down posture with the cereal conveying device 13. ing. On the left and right sides of the cutting and conveying unit 3, weed guides 14 for guiding planted cereals that are not to be cut to the lateral direction of the machine body and preventing stepping by the left and right crawler type traveling devices 2 are provided at the left and right ends. It is arranged in a state of extending from the front end portion of the weeding frame 15 supporting the divider 10 toward the front lateral side of the body frame 1.

  Although illustration is omitted, the threshing device 4 is a threshing unit that performs a threshing process on the stock side of the harvested cereal meal from the harvesting conveyance unit 3, a sorting unit that performs a sorting process on the processed product from the threshing part, And the collection unit which collects the selected single grain as the first thing and collects the grain with branch infestation as the second thing, etc., and the like, the collected first thing through the conveyor Supplied to the grain tank 6, the second item is returned to the sorting unit via the second reduction device, dust such as broken straw is discharged from the dust outlet to the outside of the machine, and the waste after the threshing process is discharged This is supplied to the processing unit 5. The 2nd reduction | restoration apparatus is equipped with the process part which performs a threshing process with respect to the 2nd thing again.

  Although illustration is abbreviate | omitted, the waste straw processing part 5 supplies the waste straw from the threshing part to the shredding device, and the long straw discharge state which conveys the waste straw from the threshing part as it is to the rear of the machine and releases it outside the machine. Then, it can be switched to a shredded release state that is shredded and then released to the outside of the machine.

  As shown in FIGS. 1 and 2, the grain tank 6 is located behind the grain tank 6 at a work position located behind the boarding operation unit 8 and a maintenance position where the back of the boarding operation unit 8 is opened. It is configured so that the position can be changed around the set vertical axis P1, and in the state where the position is changed to the work position, the storage of the grain conveyed by the lifting conveyor and the stored grain discharging apparatus 7 can be discharged to the outside of the machine, and in the state where the position is changed to the maintenance position, it is provided between the threshing device 4 and the grain tank 6 or between the grain tank 6 and the boarding operation unit 8. This makes it easier to perform maintenance work on various devices, transmission systems, operation systems, and the like.

  The grain discharging device 7 conveys the grains stored in the grain tank 6 backward with a bottom screw (not shown) arranged in the front-rear direction at the bottom of the grain tank 6, and conveys the bottom screw. A screw-type vertical conveyance unit 16 connected vertically to the end is lifted, and a screw-type discharge conveyance unit 17 connected to the conveyance end of the vertical conveyance unit 16 so as to be vertically swingable and pivotable is used for trucking. The sheet is conveyed toward a desired discharge position such as a cargo bed of the machine, and discharged from the discharge port 18 formed at the transfer end of the discharge transfer unit 17 to the outside of the apparatus.

  And the screw shaft center P1 of the vertical conveyance part 16 standingly arranged behind the grain tank 6 is set to the axis P1 for position change of the grain tank 6, and the vertical conveyance part 16 is the grain tank 6's It is also used as a post for position change.

  As shown in FIG. 1 and FIG. 3, the boarding operation unit 8 is a cross that allows the front panel 19 erected on the right front end of the body frame 1 to perform the steering of the body and the lifting operation of the cutting and transporting unit 3. Equipped with a swinging control lever 20 and a display panel 21 for displaying the traveling speed, etc., and connected to the left end of the front panel 19 on a side panel 22 erected on the front left and right center side of the body frame 1 , A main transmission lever 23 that enables a shifting operation of a hydrostatic continuously variable transmission (not shown) provided as a main transmission, and a gear transmission (not shown) installed in a transmission case (not shown) as an auxiliary transmission. Sub-transmission lever 24 that enables gear shifting operation (not shown), and threshing clutch that interrupts transmission operation to and from threshing device 4 and switching operation of cutting clutch (not shown) that intermittently transmits power to cutting and conveying unit 3 A clutch lever 25 or the like that enables a switching operation (not shown) is provided, and a boarding step 26 made of a resin molded product is laid on the right front portion of the fuselage frame 1 partitioned by the front panel 19 and the side panel 22. A driver's seat 27 is arranged above the boarding step 26 and formed.

  Although not shown, the front panel 19 and the side panel 22 are configured by attaching a sheet metal decorative panel to a panel frame formed of a square pipe material or the like.

  As shown in FIGS. 1 and 3 to 6, the driver's seat 27 is supported by an upper part of an engine bonnet 28 that forms an engine room below the driver's seat 27, and the engine bonnet 28 is set at a lower right part thereof. The bonnet body 29 connected to the body frame 1 so as to be able to open and close around the longitudinal axis P2 and the vertical axis P3 set at the right rear portion of the bonnet body 29 are opened and closed. The right side wall 30 connected to the bonnet main body 29 is configured so as to be possible, and an intake port 31 is formed in the right side wall 30 and a dustproof net 32 is stretched.

  The overall opening / closing operation of the engine bonnet 28 can be performed when the cabin 9 is removed.

  Although not shown, a lock mechanism is provided between the bonnet body 29 and the right side wall 30 to enable the right side wall 30 to be fixed and held at the closed position. Further, the engine bonnet 28 may be configured so that the entire opening / closing operation is not possible and only the opening / closing operation of the right side wall 30 is possible.

  As shown in FIGS. 1, 4, and 5, in the engine room, a water-cooled engine 34 that is mounted in a vibration-proof manner with the output shaft 33 facing left and right, and cooling that is mounted on the right side of the engine 34. Fan 35, radiator 36 standing on the right side of cooling fan 35, air-conditioning condenser 37 and receiver 38 provided on the right side of radiator 36, and air cleaner 39 provided on the upper side of engine 34 , Etc. are accommodated, and the engine 34 is configured to cool the engine 34 by introducing the outside air removed by the dust screen 32 into the engine room by the suction action of the cooling fan 35.

  And maintenance work such as removal of dust adhering to the radiator 36 and the condenser 37, replenishment of air conditioning refrigerant, and element replacement of the air cleaner 39 is performed by opening the right side wall 30 to open the right side of the engine room. Can be done by doing.

  As shown in FIGS. 1, 3, and 5 to 8, the cabin 9 includes a windshield 43, a left side glass 44, and a right side glass on a cabin frame 42 provided with a door frame portion 41 that forms a passenger entrance 40 on the right side. 45, a rear glass 46, a roof portion 47, and the like are provided to form a cabin body 48, and a front closing position for closing the entrance 40 and a rear side that opens the entrance 40 are opened to the right side of the cabin body 48. The slide door 49 is configured to be slidable over the fully open position.

  As shown in FIGS. 1 and 6, the door frame portion 41 includes an engine bonnet 28 below the driver seat 27 that is the lower portion of the boarding operation portion 8. The lower side is configured to form a shape that is biased toward the front, whereby the boarding operation part 8 is provided with the engine bonnet 28 in the lower rear part, but the boarding / alighting may be reduced by the influence thereof. The lower side of the mouth 40 can be secured widely, and as a result, the boarding / alighting from the boarding / alighting port 40 can be performed satisfactorily.

  As shown in FIGS. 6 and 7, the roof portion 47 includes a roof substrate 51 on which the air conditioner 50 and the like are placed, an inner roof 53 that forms an air conditioning air passage 52 between the roof substrate 51, and those Is constituted by an outer roof 54 and the like that cover the surface from above.

  As shown in FIGS. 1, 3, and 5 to 12, the slide door 49 is formed on a glass plate 55 formed in a shape capable of closing the entrance / exit 40, and its upper and lower middle front end (front end of the upper side lower end). ) Between the inside and outside, and a pair of plates 56 and 57 are connected, and the outside plate 56 is equipped with an external handle 58 and the like that enables sliding operation from the outside of the slide door 49 and the inside thereof. The inner handle 59 that enables the sliding operation from the inside of the slide door 49 and the upper portion of the door frame portion 41 that is integrated with the upper portion of the door frame portion 41 when the slide door 49 reaches the closed position. The first catcher 61 that is locked to the fixed pin 60 and holds the slide door 49 in the closed position, and the upper rear portion of the door frame portion 41 as the slide door 49 reaches the fully open position. A frameless structure equipped with a second catcher 63, etc. that holds the slide door 49 in the closed position by locking with the second fixing pin 62 that is integrally provided, and is lighter and less expensive than the case with a frame. Therefore, the structure is simplified and the operability and visibility are improved.

  Further, the glass plate 55 is formed in a shape that allows the entrance / exit 40 to be closed, that is, in the same manner as the entrance / exit 40, the lower side is biased toward the front with respect to the upper side, so that the slide door 49 is closed. It is possible to secure a wide field of view of the aircraft in the state of being positioned at the right front lower side.

  As shown in FIG. 9, the first catcher 61 and the second catcher 63 can be released from the outside by pressing the release button 64 provided at the base of the external handle 58, and the internal handle 59. The release operation from the inside is made possible by the push-down operation of the release lever 65 provided in the vicinity.

  Although not shown, a thin plate-like elastic body is interposed between the glass plate 55 and the inner and outer plates 56 and 57.

  As shown in FIGS. 1, 3, and 5 to 12, the cabin frame 42 has a swing arm 67 having a longitudinal support shaft 66 at the free end at the upper end of the door frame 41. Further, a swing arm 69 having a longitudinal support shaft 68 at the free end is swingably mounted on the lower end side of the door frame portion 41 so as to swing back and forth. A front-rear guide rail 72 that slides and guides a sliding member 71 having a longitudinal support shaft 70 in the front-rear direction is provided at the lower portion. A connecting tool 73 connected to the upper end of the front side of the glass plate 55 is fitted on the support shaft 66 of the upper swing arm 67 so as to be relatively rotatable, and is attached to the support shaft 68 of the lower swing arm 69. The connecting member 74 connected to the lower end on the front side of the glass plate 55 is fitted so as to be relatively rotatable, and the connecting member connected to the rear side of the glass plate 55 is attached to the support shaft 70 of the sliding member 71. 75 is externally fitted so as to be relatively rotatable.

  That is, the front side of the slide door 49 is supported by a pair of upper and lower swing arms 67 and 69 that swing back and forth, and the rear side is supported by a slide member 71 that slides along a guide rail 72 facing forward and backward. As a result, when opening and closing, the front end draws an arc orbit K1, and the rear end draws a straight orbit K2, and at the half-open position in the middle of opening and closing, the front end side is located outward from the entrance 40. The front opening is formed between the entrance 40 and the entrance 40, and the visibility of the airframe toward the right front is improved.

  As a result, when performing the alignment work of positioning the right end divider 10 at the appropriate position with respect to the planted culm in the cutting and conveying unit 3 or the close operation of positioning the right end divider 10 at the appropriate position with respect to the reed. If the sliding door 49 is positioned in the half-open position and the front opening formed between the sliding door 49 and the entrance 40 is looked forward, The positional relationship of the divider 10 can be easily and reliably grasped, and the alignment work and the coasting work can be easily and efficiently performed.

  Further, in order to more easily and efficiently perform the alignment work and the fringing work, a sliding door 49 is provided between the sliding member 71 and the guide rail 72 in addition to the closed position and the fully opened position. A holding mechanism 76 that allows the position to be held at the half-open position is interposed, and this holding mechanism 76 is a ball 78 provided between the front and rear rollers 77 guided by the guide rail 72 in the sliding member 71. And a depression spring 80 that projects and urges the ball 78 toward the guide rail 72 and a depression 80 formed in the front and rear and the front and rear intermediate portions of the guide rail 72. A ball detent type is configured to hold the slide door 49 in the closed position, the fully open position, or the half open position by engaging the ball 78 (see FIGS. 10 to 12).

  As shown in FIGS. 1, 3, and 5 to 11, the guide rail 72 is bent at the joint portion with the door frame portion 41, so that the front end side of the guide rail 72 is closer to the inside of the cabin 9. Is heading towards. Therefore, at the time of the closing operation in which the slide door 49 is slid toward the closed position, the upper and lower swing arms 67 and 69 are attached to the rear side of the slide door 49 as the sliding member 71 crosses the bent portion. Along with the front side to be swung, it is displaced leftward toward the door frame portion 41. As a result, at the closed position of the slide door 49, the slide door 49 is moved to the door frame portion 41. They are in close contact with each other via a weather strip 81 provided over the entire circumference.

  Further, the guide rail 72 is disposed so as to pass above the right side wall 30 of the engine bonnet 28, so that when the right side wall 30 is opened and closed for maintenance work on the radiator 36, the condenser 37, etc. Without causing inconvenience that the guide rail 72 will interfere with the opening and closing operation of the right side wall 30 that occurs when the guide rail 72 is arranged in the cabin 9 so as to pass the lateral side of the right side wall 30, The right side wall 30 can be easily opened and closed, and as a result, maintenance work for the radiator 36, the capacitor 37, and the like can be easily performed.

  The front and rear ends of the guide rail 72 are equipped with rubber stoppers 82 that prevent the slide door 49 from coming off from the opening / closing operation range by contact with the connecting tool 75.

  As shown in FIG. 6, the slide door 49 has a support position by the upper and lower swing arms 67 and 69 set on a line L passing through the lower front and rear center of the slide door 49, and a support position by the slide member 71. Is set at the rear end of the upper side of the slide door 49.

  That is, by this setting, the upper door portion that is closer to the rear side of the slide door 49 is supported by the upper swing arm 67 at the upper end and by the sliding member 71 at the lower rear end. The lower door portion that is closer to the front is in a stable state in which the front and rear center at the lower end is supported by the lower swing arm 69, so that the slide door 49 is placed on the upper side. On the other hand, it is possible to stably support the sliding door 49 at three points by the upper and lower swing arms 67 and 69 and the sliding member 71 while having a unique shape in which the lower side is biased toward the front. Opening and closing operations can be performed smoothly and stably.

  In the sliding door 49, the inner and outer handles 58 and 59 are set on a line L passing through the front and rear centers on the lower side of the sliding door 49, like the support positions by the upper and lower swing arms 67 and 69. As a result, the sliding door 49 has a unique shape in which the lower side is biased toward the front with respect to the upper side, but the opening and closing operation of the sliding door 49 by the inner and outer handles 58 and 59 is stable. Can be done smoothly in the state. Further, in the closed position, the slide door 49 can be evenly pressed against the weather strip 81 attached to the entire periphery of the door frame portion 41 by the operation with the inner and outer handles 58, 59, and as a result, at the closed position. The degree of adhesion of the slide door 49 to the door frame portion 41 can be increased.

  As shown in FIGS. 6 to 8, 10, and 11, the upper and lower swing arms 67 and 69 are extended so as to extend from the swing support points P 4 and P 5 to the support shafts 66 and 68. These swinging fulcrums P4 and P5 are arranged and set so as to be located behind the boarding step 26, and the guide rail 72 has a rear portion extending from the rear portion of the cabin 9 toward the rear. As a result, the moving distance in the opening direction from the closed position of the slide door 49 can be increased, and accordingly, the entrance 40 in the fully opened state in which the slide door 49 is located in the fully opened position. As a result, it is easy to get on and off from the entrance 40.

  The upper and lower swing arms 67 and 69 are set so that their swing fulcrums P4 and P5 are located on the left side of the door frame 41 and closer to the inside of the machine body. , P5 to the support shafts 66 and 68, while extending the extension length from the door frame portion 41 during the swinging operation is suppressed. As a result, when the sliding door 49 is opened and closed, the front end of the sliding door 49 can be prevented from projecting to the right outside of the machine body from the extending end of the weed guide 14 provided on the right side of the cutting and conveying unit 3. Therefore, the breakage of the slide door 49 due to the slide door 49 coming into contact with another object such as a scissors can be prevented during the opening / closing operation of the slide door 49, for example, during a dredging operation (see FIG. 10).

  As shown in FIG. 7, the upper swing arm 67 is disposed at a high position where the swing fulcrum P <b> 4 disposed at a position closer to the inside of the machine body is positioned inside the air conditioning air passage 52 formed in the roof portion 47. Thus, as compared with the case where the swing fulcrum P4 is disposed below the air conditioning air passage 52, the upper space inside the cabin 9 can be secured widely. The comfortability in the cabin 9 is improved.

  As shown in FIGS. 5, 6, and 8, the lower swing arm 69 is disposed at a position lower than the boarding step 26, thereby being disposed at a position higher than the boarding step 26. Compared to the case, the lower space inside the cabin 9 can be secured widely, and the comfort in the cabin 9 is improved accordingly. Further, when the slide door 49 is in the closed position, the lower swing arm 69 is hidden under the boarding step 26, so that the interior of the cabin 9 with the entrance 40 closed can be seen. Will improve.

  As shown in FIGS. 10 and 11, the lower swing arm 69 bypasses the door frame portion 41 adjacent to the right outer side of the swing fulcrum P5 when the slide door 49 is positioned at the fully open position. Thus, the rocking fulcrum is formed so as to be bent substantially in an L shape so as to extend rearward, so that the extending length from the rocking fulcrum P5 to the spindle 68 becomes long. The position of P5 is set to a position behind the boarding step 26, and the position of the swing fulcrum P5 is set so that the extension from the door frame 41 during the swing operation is suppressed. While being set at a position closer to the inside of the aircraft than 41, it is possible to avoid that the swinging is restricted by the door frame portion 41, and when the lower swinging arm 69 is getting on and off from the entrance 40. The risk of getting in the way, Operation of Raidodoa 49, as well as getting on and off from the entrance 40 is easy to carry out.

  As shown in FIGS. 3 and 8, a hollow seal 83 that bulges into the entrance 40 is integrally formed at the right end of the boarding step 26, thereby closing the slide door 49. In the state where it is positioned, the slide door 49 is brought into close contact with the seal 83 to prevent a gap from being formed with the slide door 49. In other words, a double seal structure is provided at the lower part of the entrance 40 where chips and the like during operation can be easily blown, and the sealing performance can be improved, and the lower swing arm 69 can be moved from the clearance between the boarding step 26 and the slide door 49. It is possible to prevent a decrease in appearance due to peeping.

  The seal 83 may be made of rubber having a different configuration from the boarding step 26.

  As shown in FIGS. 1, 6, 8, 10, and 11, an auxiliary handle 84 that is used when getting on and off from the entrance 40 is provided at the upper end of the door frame 41. It is equipped with the state which protrudes toward the right outward from the door frame part 41 in the up-down direction along the upper side front end.

  In addition, the step support portion 85 of the body frame 1 that supports the boarding step 26 has an operation position in which an auxiliary step 86 used when getting on and off from the entrance 40 is projected outward from the step support portion 85 to the right. A position switching operation by swinging around the axial center P6 in the front-rear direction is provided at the storage position standing along the step support portion 85.

  The auxiliary step 86 is set so that the amount of protrusion from the cabin 9 at the operating position is substantially the same as the amount of protrusion of the auxiliary handle 84 from the cabin 9, and the sliding door 49 is in the fully open position. 9 is supported by the upper and lower swing arms 67 and 69 and the sliding member 71 so that the protruding amount from the auxiliary handle 84 and the protruding auxiliary step 86 from the cabin 9 is smaller than the protruding amount from the cabin 9.

  That is, when the slide door 49 is in the fully open position, the slide door 49 does not protrude outward from the right end of the auxiliary handle 84 or the extended auxiliary step 86. Even in the state where the slide door 49 is in the fully open position, the possibility of the slide door 49 coming into contact with other objects such as a bag can be suppressed, and the slide door 49 can be prevented from being damaged due to the contact. .

  As shown in FIG. 13, the auxiliary step 86 is switched to the retracted position in conjunction with the sliding of the slide door 49 from the fully open position to the closed position, and the slide door 49 slides from the closed position to the fully open position. Is linked to the lower swing arm 69 via an interlocking mechanism 87 made of a push-pull wire or the like so as to be switched to the operating position in conjunction with the movement position. Can be omitted.

  As shown in FIG. 1, the front end of the grain tank 6 is formed with a recess 88 that avoids contact with the rear end of the guide rail 72 when the position is changed. , And the front end of the entrance / exit 40 is opened in a fully opened state by extending the rear end of the guide rail 72 to the grain tank 6 side. While ensuring a large amount, the opening and closing operation of the grain tank 6 can be performed satisfactorily without being obstructed by the guide rail 72. As a result, when the position of the grain tank 6 is changed, the grain tank 6 Damage to the grain tank 6 and the guide rail 72 due to the contact with the guide rail 72 can be avoided in advance, and between the threshing device 4 and the grain tank 6 and between the grain tank 6 and the boarding operation unit 8. Arranged between Maintenance work can be easily performed with respect to such as have been various types of equipment and transmission system or operating system.

  As shown in FIG. 14, the grain tank 6 is formed such that the height position of the front end portion thereof is lower than the height position of the guide rail 72, so that the position of the grain tank 6 is changed. The breakage of the grain tank 6 and the guide rail 72 caused by the grain tank 6 coming into contact with the guide rail 72 may be avoided.

  Moreover, although illustration is abbreviate | omitted, when the position of the grain tank 6 is changed by forming the grain tank 6 so that the height position of the whole becomes lower than the height position of the guide rail 72, grain The grain tank 6 and the guide rail 72 may be prevented from being damaged due to the grain tank 6 coming into contact with the guide rail 72. Further, the position change between the work position and the maintenance position is changed in the horizontal direction. You may comprise so that it may carry out by sliding.

[Another Example]
Other embodiments of the present invention will be listed below.
[1] The work vehicle may be a tractor provided with a cabin 9 or a backhoe.

[2] The slide door 49 may be provided with a frame surrounding the glass plate 55, or may be formed into a vertically long rectangle. Further, when the amount of protrusion of the auxiliary handle 84 from the cabin 9 and the amount of protrusion of the auxiliary step 86 from the cabin 9 are greatly different, the auxiliary handle 84 or the auxiliary having a large amount of protrusion from the cabin 9 in the fully opened position. It may be configured such that it does not protrude outward from the side of the aircraft from step 86.

[3] As the upper and lower swing arms 67 and 69, both may be formed in a straight line, or both may be bent in a substantially L shape or the like. Further, the positions of the swing fulcrums P4 and P5 on the upper and lower swing arms 67 and 69, the length extending from the swing fulcrums P4 and P5 to the support shafts 66 and 68, and the like are the shape and slide length of the slide door 49. Various changes can be made depending on the situation.

[4] The length, number, and height position of the guide rails 72 can be variously changed according to the shape of the cabin 9, the sliding length of the slide door 49, and the like. The rear end of the guide rail 72 may be set to a length that does not extend rearward from the rear portion of the cabin 9, and in order to obtain a more stable support structure for the slide door 49, The height position of the guide rail 72 may be set to a height position at which the sliding member 71 supports the vertical center position of the sliding door 49.

[5] As shown in FIG. 15, the guide rail 72 is attached to the front rail portion 89 mounted on the cabin frame 42, the intermediate rail portion 90 mounted on the right side wall 30 of the engine bonnet 28, and the grain tank 6. You may comprise in the 3 division structure with the rear rail part 91 equipped. According to this configuration, the guide rail 72 is disposed at a height position at which the sliding member 71 supports the vertical center position of the slide door 49 so that a more stable support structure for the slide door 49 can be obtained. The opening and closing operation of the right side wall 30 for performing maintenance work on the radiator 36, the condenser 37, and the like can be enabled, and the storage capacity can be increased by eliminating the recess 88 at the front end of the grain tank 6. The grain tank 6 for performing maintenance work on various devices, transmission systems or operation systems arranged between the threshing device 4 and the grain tank 6 or between the grain tank 6 and the boarding operation unit 8. The position change operation can be made possible.

[6] Although illustration is omitted, the guide rail 72 may be configured in a two-part structure of a front rail portion mounted on the cabin frame 42 and a rear rail portion mounted on the right side wall 30 of the engine bonnet 28. Good.

[7] Various changes can be made to the configuration of the holding mechanism 76. For example, the holding mechanism 76 may be configured to act on one of the upper and lower swing arms 67 and 69. The holding position of the slide door 49 by the holding mechanism 76 may be configured to be, for example, a 1/3 open position or a 2/3 open position other than the half-open position, and the slide door 49 at a plurality of positions. It may be configured to be able to hold the position.

[8] As shown in FIG. 16, when the guide rail 72 is divided, the holding mechanism 76 is inserted into the joint between the rail portions 89 to 91 in the guide rail 72, and the sliding door 49 is engaged. May be configured as a detent type using a seam that holds the at a position in the middle of opening and closing.

[9] The auxiliary step 86 for getting on and off is configured such that the position switching between the operation position and the storage position is performed by swinging around a vertical axis or sliding in the left-right direction. Alternatively, it may be configured such that the position switching is not interlocked with the sliding of the slide door 49, and may be configured such that the position cannot be changed.

[10] The support position of the sliding door 49 by the upper and lower swing arms 67 and 69 and the sliding member 71 can be variously changed according to the shape of the sliding door 49. For example, the sliding door 49 is vertically long. In the case of a rectangular shape, the support position by the upper and lower swing arms 67 and 69 may be the front ends of the upper and lower ends of the slide door 49, and the support position by the sliding member 71 may be the rear end on the upper and lower centers of the slide door 49. Good.

[11] The positions of the handles 58 and 59 on the slide door 49 can be variously changed according to the shape of the slide door 49 and the like.

Combine side view Overall plan view of combine Plan view of boarding operation Longitudinal front view of the main part showing the configuration of the engine bonnet Cross-sectional plan view of the main part showing the configuration of the engine bonnet Side view of main parts showing cabin structure Partially cutaway front view of cabin top showing sliding door support structure Front view of the lower part of the cabin showing the sliding door support structure The perspective view of the principal part which shows the structure around the handle | steering-wheel in a slide door Longitudinal plan view of the main part showing the half-open state of the sliding door Longitudinal plan view of essential parts showing fully open and fully closed sliding doors Cross-sectional plan view of the main part showing the configuration of the holding mechanism The perspective view of the principal part which shows the linkage structure of a sliding door and an auxiliary step Overall side view of combine showing height relationship between grain tank and guide rail in another embodiment Overall side view of combine showing configuration of guide rail in another embodiment Cross-sectional plan view of the main part showing the configuration of the holding mechanism in another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 8 Boarding operation part 9 Cabin 26 Boarding step 40 Boarding gate 41 Frame 49 Sliding door 67 Swing arm 69 Swing arm 71 Sliding member 72 Guide rail 76 Holding mechanism (detent mechanism)
86 Auxiliary step 87 Interlocking mechanism K1 Circular orbit K2 Linear orbit P4 Oscillation fulcrum P5 Oscillation fulcrum

Claims (6)

An operation provided with a sliding door configured to be slidable between a front closed position that closes a boarding / exiting opening formed on a lateral side portion of a cabin that covers the boarding operation part, and a rearward fully open position that greatly opens the boarding / exiting opening. Car door opening and closing structure,
The front side of the slide door is supported by a pair of upper and lower swing arms that swing back and forth, and the rear side of the slide door is supported by a sliding member that slides along a guide rail facing forward and backward. A door opening / closing structure of a work vehicle configured such that when the door is opened and closed, a front end of the slide door draws an arcuate track, and a rear end of the slide door draws a straight track.   The door opening / closing structure for a work vehicle according to claim 1, further comprising a holding mechanism that holds the slide door at a half-open position that is spaced laterally outward from the entrance / exit toward the front end side thereof.   The door opening / closing structure of the work vehicle according to claim 2, wherein the holding mechanism is constituted by a detent mechanism interposed between the guide rail and the sliding member.   The door opening / closing structure of the work vehicle according to any one of claims 1 to 3, wherein a swing fulcrum of the swing arm is provided at a position rearward of a boarding step laid in the boarding operation unit.   2. The swing arm is bent so as to extend rearward around a frame erected laterally outward of the swing fulcrum at the fully open position of the slide door. The door opening / closing structure of the work vehicle as described in any one of -4. Auxiliary steps for getting on and off are provided so that the position can be switched between an action position that projects outward from the aircraft and a retracted position that retracts to the aircraft, and interlocks with the sliding of the slide door to the closed position. 6. An interlocking mechanism is provided for switching the auxiliary step to the retracted position and switching the auxiliary step to the operating position in conjunction with the sliding of the slide door to the fully open position. The door opening / closing structure of the work vehicle as described in any one.

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