JP5386389B2 - Work machine - Google Patents

Description

  The present invention relates to a work machine such as a hydraulic excavator, and more particularly to a work machine capable of performing work by operating an operation lever or the like from a cab.

  Generally, a work machine such as a hydraulic excavator is a front work that can be used for excavation work and the like, and a traveling body, a swiveling body disposed on the traveling body, and a swiveling body that is attached to the swiveling body so as to be vertically rotatable. A vehicle body having a device and a cab provided with an operation lever for operating the vehicle body, and an operator operates the operation lever from the cab to perform excavation work and the like. Yes. A hydraulic system is used to drive such a work machine, and the vehicle body and the operation lever are connected by a pilot hose through an opening provided on the floor surface of the cab. More specifically, a control valve for controlling the front working device and a pilot valve for outputting a pressure corresponding to the operation of the operation lever to move the spool of the control valve are connected by a pilot hose.

  By the way, the driver's cab is required to have high airtightness in order to maintain a comfortable indoor environment. That is, specifications are required so that dust, sand, and the like during operation do not enter through the gap between the floor opening in the cab and the pilot hose. As the specification, for example, the technique described in Patent Document 1 is known.

  That is, Patent Document 1 discloses a substantially rectangular parallelepiped elastic seal member having a plurality of passage holes through which hoses pass and slits cut from one side surface so as to be connected to the passage holes, and this elastic seal member. Dust from the gap between the opening through which the hoses are inserted and the hoses by a holding member having a pressing plate for holding down and a bolt for fixing the pressing plate to a mounting seat provided on the rear end surface of the box-shaped portion. And a technique for blocking the entry of sand and the like.

JP 2001-20320 A (paragraphs 0030, 0031, etc.)

  However, since the conventional technique requires a holding member having a complicated structure, the cost for maintaining the airtightness in the cab is very high. In addition, in the case of a specification in which the position of the operation lever can be adjusted according to the physique of the operator, the pilot hose also moves to some extent along with the adjustment of the position of the operation lever. Therefore, the movement of the pilot hose is restricted, and the application of the above-described conventional technique to a place on the assumption that the pilot hose moves is unsuitable.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an inexpensive and simple structure of a work machine in which dust and sand do not enter from a gap between a pilot hose and an opening through which the pilot hose passes. It is to be provided by. Furthermore, it is another object of the present invention to provide a work machine in which the airtightness in the cab is not lost even when the pilot hose is moved.

In order to achieve the above object, the present invention provides a vehicle main body provided with a front working device, and a driver's cab provided with a hydraulic pilot type operating lever device mounted on the vehicle main body and operating the front working device. And a plurality of pilot hoses that connect the control lever for controlling the front working device and the operation lever device, and the operation lever device is capable of adjusting the mounting position in a state where the plurality of pilot hoses are connected. are possible, the protection in the in the floor of the cab working machine in which an opening for inserting the plurality of pilot hose is provided, attached to the opening, the plurality of pilot hose is inserted into the opening and the grommet to, wound around the outer peripheral surface of the grommet, the gap between said grommet plurality of pilot hoses It includes a band of Gutame, wherein the grommet includes a fitting portion recessed grooves fit into the opening formed on the outer peripheral surface, on at least one side of the insertion direction of the pilot hose from the fitting portion A cylindrical portion provided so as to protrude, and the cylindrical portion is formed with a recess for winding the band on an outer peripheral surface thereof, and an arc groove on the inner wall thereof along the insertion / extraction direction of the pilot hose The pilot hose and the pilot hose in which the inner diameter of the arc groove is formed to be substantially the same as the radius of the pilot hose and the ridges formed by connecting the adjacent arc grooves are bundled together And the gap between the inner wall of the cylindrical portion and the plurality of pilot hoses is filled .

  In the present invention configured as described above, the gap between the opening and the pilot hose can be closed only by tightening the grommet with a band, and the airtightness in the cab can be maintained. That is, dust and sand can be prevented from entering the cab with a simple and inexpensive structure such as a grommet and a band. In addition, since the grommet and pilot hose are tightened by the band, the gap between the grommet and the pilot hose is less likely to occur even in places where the pilot hose moves as the position of the operation lever device is adjusted. The airtightness is almost never lost. Therefore, it can be said that the present invention is suitable for application to a place where the pilot hose moves.

  According to the present invention configured as described above, the grommet can be easily attached only by fitting the groove into the periphery of the opening. In addition, since the depression is formed, the depression prevents the band from shifting even when the pilot hose moves. Therefore, even if the pilot hose is used in a place where the hose moves, it is possible to suppress the looseness of the band and to maintain the airtightness in the cab for a long period of time.

  According to the present invention, the gap between the grommet and the pilot hose can be closed with an inexpensive configuration that only tightens the grommet with a band, and the airtightness in the cab can be maintained. Moreover, since the band is fastened, the airtightness is hardly lost even if the pilot hose moves.

1 is a side view showing a hydraulic excavator that is an embodiment of a work machine according to the present invention. FIG. 2 is a side view showing a part of a driver's cab of the hydraulic excavator shown in FIG. 1 and showing a state where an operation lever device has moved forward. FIG. 2 is a side view showing a part of a driver's cab of the hydraulic excavator shown in FIG. 1 and showing a state in which an operation lever device has moved backward. It is an external appearance perspective view of the grommet which concerns on the example of 1st Embodiment used for the hydraulic shovel shown in FIG. It is an external appearance perspective view of the grommet which concerns on the 2nd Example used for the hydraulic shovel shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a hydraulic excavator that is an embodiment of a work machine according to the present invention includes a crawler type traveling body 2, a revolving body 3 disposed on the traveling body 2, and the revolving body 3. A cab (driver's cab) that is mounted on the revolving body 3 and operates the front work device 4, which is mounted on the front work device 4 that can be pivoted in the vertical direction and can perform excavation work and the like. 10. The swivel body 3 supplies and discharges an engine (not shown) for driving a hydraulic pump (not shown) and pressure oil discharged from the hydraulic pump to the front working device 4 to control the front working device 4. A control valve 5 and the like are provided.

  Further, the front working device 4 includes a boom 6 that is rotatably attached to the revolving structure 3, an arm 7 that is attached to the tip of the boom 6 via a connecting pin so as to be relatively rotatable, and a tip of the arm 7. And a bucket cylinder 6 a for driving the boom 6, an arm cylinder 7 a for driving the arm 7, and a bucket cylinder 8 a for driving the bucket 8. . The front working device 4 is lifted by operating an operation lever device 20 described later, and performs excavation work of earth and sand.

  The cab 10 has a box shape surrounded by a wall. A traveling operation lever / pedal (not shown) is provided on the front side, and a driver's seat 11 on which an operator is seated as shown in FIG. Operation lever devices 20 are provided on both sides of the seat 11. The operation lever device 20 is connected to the control valve 5 (see FIG. 1) by a plurality of pilot hoses 30. When the operation lever 20 is operated, the front work device 4 is activated via the control valve 5. Yes. Further, the floor surface 12 of the cab 10 is provided with openings 15 for inserting a plurality of pilot hoses 30, and the plurality of pilot hoses 30 connected to the operation lever device 20 pass through the openings 15. The cabin 10 is pulled out of the room.

  The opening 15 has a rectangular shape, and a grommet 40 is fitted to the peripheral edge so as not to damage the pilot hose 30. As shown in FIG. 2 or FIG. 3, the outer peripheral surface of the grommet 40 with the plurality of pilot hoses 30 inserted therein is fastened by a band 50. This band 50 is for tightening the grommet 40, and in this embodiment, a band of a type that can be rebound (a type that can be used repeatedly) is used. The detailed structure of the grommet 40 will be described later.

  Next, in the operating lever device 20, a lever main body 21 and a pilot valve 25 that outputs a pilot pressure to the control valve 5 according to the operation of the lever main body 21 are accommodated in the console box 22. The armrest 23 is attached to the floor surface 12 via a lever position adjusting mechanism 17 described later. By operating the lever position adjusting mechanism 17, the operating lever device 20 is slid back and forth (left and right in FIG. 2 or 3) as a whole unit. More specifically, as shown in FIG. 3, the operating lever device 20 is moved from the position where the armrest 23 is closest to the driver's seat 11, that is, the position where the armrest 23 slides most backward (leftward in FIG. 3). 2, the armrest 23 is configured to slide by a distance X between a position farthest from the driver's seat 11, that is, a position slid forward (right direction in FIG. 2). The console box 22 displays various electrical components (air conditioning switch, work mode selection switch, travel mode selection switch, light switch, radio operation switch, engine start switch, and operation status of each switch (not shown). A liquid crystal panel, a display device such as a lamp).

  The lever position adjusting mechanism 17 includes a rail 17a on which the operation lever device 20 is placed, and a lock lever 17b for fixing and releasing the position of the operation lever device 20. When the lock lever 17b is operated so as to release the fixed position, the operating lever device 20 slides along the rail 17a. When the lock lever 17b is operated so as to fix the position of the operating lever device 20, the operating lever device 20 is operated. The device 20 is positioned and fixed at that position.

  Here, as the operation lever device 20 slides, the plurality of pilot hoses 30 connecting the pilot valve 25 and the control valve 5 are pulled by the operation lever device 20 as shown in FIG. 2, or as shown in FIG. However, the gap between the grommet 40 and the plurality of pilot hoses 30 is not widened by the grommet 40 and the band 50 wound around the outer peripheral surface of the grommet 40, The airtightness in the cab 10 is maintained. The structure of the grommet 40 will be described in detail below with reference to FIG.

  The grommet 40 according to the first embodiment suitable for use in the above-described hydraulic excavator is made of a hard resin material and includes a fitting portion 41 and a cylindrical portion 43 as shown in FIG. . The fitting portion 41 is formed with a concave groove 42 for fitting the opening 15 in the outer peripheral surface thereof. When the concave groove 42 of the fitting portion 41 is fitted into the opening 15, the peripheral edge portion of the opening 15 is sandwiched between the pair of wall portions 41 a and 41 b separated by the concave groove 42.

  Moreover, the cylindrical part 43 has comprised the rectangular cylinder shape, and is the one side in the insertion / extraction direction of the pilot hose 30 from one wall part 41b of the fitting part 41, ie, the insertion / extraction direction of the pilot hose 30 in FIG. Is the vertical direction, and is provided so as to protrude upward on one side thereof. As for this cylindrical part 43, the hollow part 44 is formed in 1 round on the outer peripheral surface. The recess 44 has a recess shape having a width slightly larger than the width of the band 50 and a depth slightly larger than the thickness of the band 50. The band 50 is prevented from being displaced in the insertion / extraction direction of the pilot hose 30 by both end edges 43a, 43b of the recess 44.

  Further, a plurality of arc grooves 45 are formed in the inner wall of the cylindrical portion 43 along the insertion / extraction direction of the pilot hose 30. The inner diameters of these arc grooves 45 are almost the same as the radius of the pilot hose 30, and the pilot hose 30 between the pilot hose 30 and the pilot hose 30 in which the ridges 45 a formed by connecting the adjacent arc grooves 45 are bundled. The space between the inner wall of the cylindrical portion 43 and the plurality of pilot hoses 30 is filled.

  As described above, when the outer peripheral surface of the grommet 40 is tightened by the band 50 with the grommet 40 according to the first embodiment fitted in the opening 15 and the plurality of pilot hoses 30 inserted, a plurality of grommets 40 are tightened. A gap between pilot hose 30 and grommet 40 is closed. Furthermore, even if the plurality of pilot hoses 30 move as the operating lever device 20 slides, the plurality of pilot hoses 30 hardly move in the grommet 40 because they are tightened by the tight band 50. In addition, since the band 50 is wound around the recess 44, there is no concern that the band 50 will come off or loosen even if the pilot hose 30 moves.

  Therefore, gaps between the plurality of pilot hoses 30 and the grommets 40 do not widen, the airtightness in the cab 10 is maintained, and a comfortable environment in the cab 10 can be maintained. In addition, the airtightness in the cab 10 can be sufficiently maintained with an inexpensive and simple configuration of the grommet 40 and the band 50. In addition, since the above-mentioned grommet 40 is formed with a plurality of arc grooves 45 on the inner wall of the cylindrical portion 43, it can be said that it is suitable when a plurality of pilot hoses 30 are inserted.

  On the other hand, when one pilot hose 30 is inserted, a grommet 140 according to the second embodiment as shown in FIG. 5 may be used. The grommet 140 is made of a hard resinous material and includes a fitting portion 141 and a cylindrical portion 143. The fitting portion 141 is formed with a concave groove 142 for fitting the opening 15 in the outer peripheral surface thereof. When the concave groove 142 of the fitting portion 141 is fitted into the opening 15, the peripheral edge portion of the opening 15 is sandwiched between the pair of wall portions 141 a and 141 b separated by the concave groove 142. The configuration of the fitting portion 141 is the same as that of the grommet 40 shown in FIG.

  Further, the cylindrical portion 143 has a cylindrical shape having substantially the same diameter as the pilot hose 30 to be inserted, and protrudes from the wall portion 141b to one side (upward direction in FIG. 5) of the pilot hose. Is provided. The cylindrical portion 143 has a hollow portion 144 formed on the outer peripheral surface thereof once. The depression 144 has a depression shape having a width slightly larger than the width of the band 50 and a depth slightly larger than the thickness of the band 50. The band 50 is prevented from being displaced in the insertion / extraction direction of the pilot hose 30 by both edge portions 143a, 143b of the recess 144. Note that no irregularities are formed on the inner wall of the cylindrical portion 143. Thus, the shape of the cylindrical part 143 is different from the grommet 40 shown in FIG.

  According to the grommet 140 according to the second embodiment, the gap between the pilot hose 30 and the grommet 140 can be obtained simply by tightening the outer peripheral surface of the grommet 140 with the band 50 with one pilot hose 30 inserted. In addition, even if the pilot hose 30 moves as the operating lever device 20 slides, the pilot hose 30 is hardly moved in the grommet 140 because it is tightened by the band 50. In addition, since the band 50 is wound around the recess 144, there is no fear that the band 50 may come off or loosen even if the pilot hose 30 moves.

  Therefore, the gap between the pilot hose 30 and the grommet 140 does not widen, the airtightness in the cab 10 is maintained, and a comfortable environment in the cab 10 can be maintained. Moreover, the airtightness in the cab 10 is sufficiently maintained even with an inexpensive and simple configuration such as the grommet 140 and the band 50. In the grommet 140 described above, since the inner diameter of the tubular portion 143 and the outer diameter of the pilot hose 30 are substantially the same diameter, there is almost no gap between the pilot hose 30 and the inner wall of the tubular portion 143. Therefore, the grommet 140 is suitable when a single pilot hose 30 is inserted.

  Here, the above-mentioned grommets 40 and 140 can be used not only by being fitted into an opening for inserting a pilot hose, but also by being fitted into an opening for inserting an electric cable or a harness. In this case, the grommets 40 and the grommets 140 may be properly used according to the form of the bundle of electric cables and harnesses. Moreover, although the cylindrical parts 43 and 143 gave and demonstrated the shape which protruded only upward from the fitting parts 41 and 141 as an example, it is not restricted to this, The vertical direction, ie, the insertion / extraction direction of the pilot hose 30 is demonstrated. A cylindrical portion protruding in both directions is further formed, and the cylindrical portions 43 and 143 protruding upward are wound not only by the band 50 but also wound around the cylindrical portion protruding downward. Also good. According to such a configuration, there is an advantage that the airtightness is further increased.

DESCRIPTION OF SYMBOLS 1 Vehicle main body 4 Front work apparatus 5 Control valve 10 Cab (cab)
12 Floor 15 Open 20 Operation lever device 30 Pilot hose 40, 140 Grommet 41 Fitting part 42 Concave groove 43 Cylindrical part 44 Recessed part 50 Band

Claims (1)

A vehicle body provided with a front working device, a cab mounted on the vehicle body and provided with a hydraulic pilot type operating lever device for operating the front working device, and a control valve for controlling the front working device And a plurality of pilot hoses connecting the operation lever device, and the operation lever device is capable of adjusting a mounting position in a state in which the plurality of pilot hoses are connected to the floor surface of the cab. Is a work machine provided with an opening for inserting the plurality of pilot hoses,
A grommet that is attached to the opening and protects the plurality of pilot hoses inserted into the opening, and is wound around an outer peripheral surface of the grommet to close a gap between the grommet and the plurality of pilot hoses. With a band of
The grommet includes a fitting portion in which a concave groove that fits into the opening is formed on the outer peripheral surface, and a tubular portion that protrudes from the fitting portion to at least one side in the insertion / extraction direction of the pilot hose, With
The cylindrical portion is formed with a recess for winding the band on the outer peripheral surface, and a plurality of arc grooves are provided on the inner wall along the insertion / extraction direction of the pilot hose,
The space between the pilot hose and the pilot hose in which the inner diameter of the arc groove is formed to be substantially the same as the radius of the pilot hose and bundled with the protrusions formed by connecting the adjacent arc grooves. A working machine that is configured to enter and fill gaps between an inner wall of the cylindrical portion and the plurality of pilot hoses .

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