JP2013244808A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working vehicle that can enhance dustproofness of an engine room by tightly attaching a dust-protection body, covering vent holes formed in a curved part of a hood from the inside, to an inner surface of the curved part.SOLUTION: A dust-protection body 27 is composed of a resin net having a ventilation part 27a facing vent holes 22, 23, and a large number of mounting holes bored near an outer periphery of the ventilation part. A pressing plate 28 for preventing uplift of the dust-protection body 27 is composed of a resin plate having openings facing the vent holes 22, 23 and a large number of mounting holes 28b. Each of the mounting holes of the dust-protection body and the pressing plate is externally fitted by insertion in the order of each of the mounting holes to a large number of protrusions 16f provided near the outer peripheries of the vent holes 22, 23 on a rear-surface side of a hood 15, and then, snap rings 29 are inserted thereto so as to fix the dust-protection body and the pressing plate to the hood.

Description

  The present invention relates to a work vehicle such as a tractor, and more particularly to a bonnet structure that covers an engine, a radiator, and the like.

  In general, a work vehicle such as a tractor has an engine disposed at the front part of a traveling machine body, and an auxiliary machine such as a radiator disposed further forward, and a bonnet is disposed so as to cover the engine and the radiator. Yes. The bonnet includes a front grill that covers the front part, left and right side covers that cover the left and right side surfaces, and a bonnet hood that covers the upper part. A plurality of ventilation holes serving as cooling air passages for the radiator are formed from the front side to the side of the bonnet, and these ventilation holes are covered with a dustproof body so that dust does not enter.

  Further, punching metal is often used as the dustproof body. However, when punching metal is used, the bending process is increased in order to match the bonnet shape, thereby hindering cost reduction. Therefore, what uses the resin-made net | network instead of punching metal is proposed (refer patent document 1).

JP-A-8-85475

  By the way, the bonnet is formed in a dome shape that covers the engine. For example, a plurality of ventilation holes formed in a front grill or the like may be formed in a curved portion. However, on the other hand, the resin net is generally formed in a flat sheet shape.

Therefore, if the resin net is attached to the back of the front grill with several screws to block the ventilation holes formed in the curved part of the front grill etc., the outer periphery of the resin net is partially May cause a gap without being completely adhered to the rear surface of the front grille, which may affect the dust resistance of the engine room. Therefore, if the number of screws is increased to prevent lifting, the man-hours for assembling the resin net increase, and there is a problem that the cost cannot be reduced.
Moreover, when the rear end portion of the resin net is attached to the front grill by the holding portion of the stop member as in Patent Document 1, it is not necessary to attach the resin net directly with the screw. Once the plastic net is deformed due to some external force acting on the plastic net, the end of the net will come off the presser foot, and then the net will not return to its original position even if it tries to recover by its own elastic force. In this case as well, there is a possibility that a gap is generated.

  Therefore, the present invention reliably attaches a resin net that covers the ventilation holes formed in the curved portion such as the front grille of the bonnet from the back side over the entire circumference of the back surface of the curved portion, and is made of resin. An object of the present invention is to provide a work vehicle capable of reducing the cost while improving the dust-proof property of the engine room by eliminating the displacement of the net with respect to the ventilation hole.

  The present invention provides a work vehicle having a ventilation hole for introducing or discharging cooling air to a bonnet that covers an engine, a radiator, etc., and covering the ventilation hole with a dustproof body, wherein the dustproof body faces the ventilation hole. And a pressing plate for preventing the dustproof body from rising, and an opening facing the ventilation hole and a large number of mounting holes. After inserting the mounting holes of the dustproof body and the holding plate in that order into a number of protrusions provided in the vicinity of the outer periphery of the ventilation hole on the back side of the bonnet, a retaining ring is inserted. Inserting and fixing the dustproof body and the holding plate to the bonnet.

  In addition, a projection is provided in the vicinity of the outer periphery of the ventilation hole on the back surface side of the bonnet so as to engage with the mounting holes of the dustproof body and the pressing plate and prevent the lifting of these.

  According to the first aspect of the present invention, when the dustproof body and the pressing plate are fixed to the back surface side of the bonnet, the pressing plate presses the outer peripheral edge of the ventilation portion of the dustproof body against the back surface side of the bonnet to prevent the dustproof body from lifting. In addition, since the dustproof body and the holding plate are fitted with a projection on the back side of the bonnet in the mounting hole to prevent displacement of the dustproof body with respect to the ventilation hole, It is possible to prevent a gap from being generated in the engine room and to improve the dustproof property of the engine room.

  According to the second aspect of the present invention, even when the protrusions are not perpendicular to the dustproof body and the pressing plate, the protrusions engage with the mounting holes of the dustproof body and the pressing plate to prevent the lifting. In this case, since a retaining ring is not required, the cost can be reduced.

It is a perspective view which shows the front part of the tractor which is a work vehicle to which this invention is applied. It is an expansion | deployment perspective view which shows the attachment state of a bonnet. It is a side view of the front part of a tractor. It is a front view of a front grille. It is a rear view of a front grill. It is a front view of a dustproof body. It is a front view of a pressing plate. It is a development perspective view showing attachment to a front grill of a dustproof object and a control plate. It is a rear view of the front grille after attaching a dustproof body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the tractor (work vehicle) 1 has a traveling machine body 2 supported by front wheels and rear wheels (not shown). The traveling machine body 2 includes an engine 3 and a clutch housing 4. The transmission case 5 is integrally connected. A chassis frame 6 for attaching a front axle case to the lower part is fixed to both sides of the engine 3 by bolts, and a bottom plate 7 is fixed to an upper surface on the front side of the chassis frame 6. A radiator 8 and a connecting frame 9 are erected on a chassis frame 6 in front of the engine 3, and an engine accessory such as a battery is attached to the bottom plate 7. Further, a panel mounting frame 10 fixed to the clutch housing 4 with the base portion standing upward is provided with a shielding plate 11 for partitioning the front engine compartment and the rear control portion, a fuel tank 12, a meter panel 13, a steering handle. 14 etc. are attached.

  A bonnet 15 is installed at the front of the traveling machine body 2 so as to surround an engine room in which the engine 3 and the like are disposed. The bonnet 15 includes a front grill 16 covering a front side of the engine 3 and the like, It consists of left and right side covers 17 that cover the left and right side surfaces, and a hood hood 18 that covers the upper side. The bonnet hood 18 is configured such that the rear part is rotatably supported via a hinge provided on the upper part of the panel mounting frame 10 and the front part can be opened and closed. A latch provided on the front part of the bonnet hood 18 is provided. When the catcher 19 provided on the upper portion of the connecting frame 9 is captured, the hood hood 18 can be held closed.

  On the other hand, the front grill 16 has a headlamp 20 at the center of the upper side and corner lights 21 at both sides thereof, and vent holes 22 and 23 for taking in the cooling air of the radiator 8 at the center of the lower side and both sides thereof. Is provided. Further, the front grill 16 has a lower projection 16a fitted in an insertion hole 7a provided in the bottom plate 7, and an upper connecting piece 16b is fastened to the upper portion of the connecting frame 9 using a bolt 24 with a knob. Thus, it is detachably mounted on the bottom plate 7. The left and right side covers 17 are provided in the side cover 17 in the insertion holes 7b formed in the bottom plate 7 while inserting holes provided in the rear end surface into the front and rear pins 10a and 10a provided in the panel mounting frame 10. In a state where the locking piece 17a is inserted, the locking portion 17b provided at the upper part is detachably attached by fastening to the connecting frame 9 using a bolt 24 with a knob provided at the upper part of the connecting frame 9. The left and right side covers 17 are provided with ventilation holes 17c for discharging cooling air after the radiator 8 has been cooled.

  Further, the front grill 16 will be described in detail. As shown in FIGS. 4, 5, and 8, the front grill 16 is curved and formed with a resin in a U shape with the rear in plan view open. An opening 25 is provided in the center of the upper side of the front grille 16, and the headlamp 20 is fitted into the opening 25, and the headlamp 20 is attached to the surrounding mounting portion 16c through a bolt and a screw. . Openings 26 and 26 are also provided on the left and right side surfaces on the upper side of the front grille 16, and the corner lights 21 and 21 that illuminate the sides of the front wheels are similarly fitted and attached to the openings 26 and 26. Further, openings 22, 23, 23 serving as ventilation holes for taking in cooling air of the radiator 8 are provided at the lower center of the front grill 16 and on both sides thereof.

  And the edge part 16d which comprises the outer edge of the ventilation holes 22,23,23 of the front grille 16 is formed in the rib shape which protrudes a little on the back surface side, and the center of the ventilation holes 22,23,23 in three places In the vicinity of the outer periphery of the edge 16d of the ventilation hole 22, a plurality of protrusions 16g including left and right protrusions 16e and 16e provided with screw insertion holes and small-diameter protrusions 16f are formed. Also, projections 16h and 16h that are longer than the projection 16f and flat in the left-right direction are formed at two locations in the vicinity of the outer periphery of the edge 16d of the two ventilation holes 23 and 23 on both sides. . Further, two protrusions 16i, 16i that are flat in the vertical direction are formed at two positions on the rear side near the outer periphery of the edge 16d of the ventilation holes 23, 23. As shown in FIG. 8, two ribs 16j and 16j in the front-rear direction are formed on the back side of the curved portion of the front grill 16, and the rigidity of the front grill 16 is ensured. The ribs 16j and 16j are provided in parallel with each other to form a groove 16k therebetween, and wiring such as the headlamp 20 and the alarm horn is routed and held in the groove 16k. This eliminates the need for clamps and reduces the number of parts and assembly man-hours. The ventilation holes 22, 23, 23 are covered with a dustproof body 27 so that dust does not enter.

  Here, the dustproof body 27 is formed of a resin net as shown in FIG. 6, and this net has a number of rectangular holes A adjacent to each other in the vertical and horizontal directions by an appropriate net pitch p, and the passage of dust is not allowed. It is configured to prevent but allow the passage of cooling air. For example, a plastic net made of high-density polyethylene is used so that the plastic net can cover all the ventilation holes 22, 23, 23 in series. By cutting as a single sheet, it can be manufactured at low cost. In addition, as a resin net, by selecting a plastic net made of high-density polyethylene, which has excellent weather resistance, chemical resistance, cold resistance, and heat resistance, it does not rust like punching metal and fades. Can be used over a long period of time.

  More specifically, the dustproof body 27 formed of the resin net of the present invention has a ventilation portion 27a that is wide by several millimeters outward from the outer periphery of the openings of the ventilation holes 22, 23, 23. In addition to cutting out from the net, a large number of mounting holes 27b are formed in the vicinity of the outer periphery of the ventilation portion 27a so as to correspond to the protrusions 16f and 16h of the front grille 16.

  Next, the pressing plate 28 that prevents the dustproof body 27 from being lifted will be described. As shown in FIG. 7, the holding plate 28 has an outer shape that matches the shape of the dustproof body 27, and includes openings B, C, and C at portions corresponding to the ventilation holes 22, 23, and 23. It is also composed of a resin plate with high rigidity. Also, the holding plate 28 is provided with the same mounting holes 28b... In the portions corresponding to the mounting holes 27b.

  In the configuration of the dustproof body 27 and the pressing plate 28 as described above, when the dustproof body 27 and the pressing plate 28 are mounted on the back side of the ventilation holes 22, 23, 23 of the front grill 16, FIG. 8 and FIG. As shown in the drawing, while the dustproof body 27 is appropriately curved, the mounting holes 27b of the dustproof body 27 are inserted into the projections 16f of the front grille 16 and the flat projections 16h, and then the presser plate 28 is similarly mounted. The holes 28b are inserted into the protrusions 16f and the flat protrusions 16, and the protrusions 16f protruding from the mounting holes 28b of the holding plate 28 are inserted into the ends by pushing a retaining ring such as a push nut 29 to kill them. By doing so, the dustproof body 27 and the pressing plate 28 can be attached to the back side of the ventilation holes 22, 23, 23 of the front grill 16.

  The flat protrusion 16h of the front grill 16 is simply fitted with a mounting hole 27b long in the left-right direction of the dustproof body 27 and a long mounting hole 28b in the left-right direction of the holding plate 28, and a retaining ring is attached here. Not used. This relates to the direction in which the front grill 16 is molded from resin, and the front grill 16 of this embodiment has the front-rear direction as the mold extraction direction. Therefore, the axial direction of the other projections 16f including the flat projections 16h is also the front-rear direction. Here, the ventilation holes 23 corresponding to the flat projections 16h are provided on the side surfaces of the front grille 16, and the projections 16h The direction of the opening surface of the ventilation hole 23 is close to the same direction, and even if a retaining ring, a screw, or the like is inserted in the axial direction in the flat protrusion 16h, the edge of the ventilation hole 23 It cannot be tightened accurately toward the portion 16d. Therefore, in the present embodiment, the dustproof body 27 and the pressing plate 28 are flattened by using the fact that the dustproof body 27 and the pressing plate 28 obliquely intersect with the flat protrusion 16h according to the location. The dustproof body 27 is prevented from being lifted up by being locked to the base side of 16h.

  Further, the right and left end portions of the dustproof body 27 and the pressing plate 28 cannot form protrusions orthogonal to the surfaces of the mounting holes 27b and 28b due to the drawing direction of the mold. Therefore, a projecting piece 16i is formed at the location of the front grill 16 and a speed nut 30 is inserted into the projecting piece 16i, and then a screw 31 is inserted into the mounting holes 27b and 28b of the dustproof body 27 and the holding plate 28. The dustproof body 27 and the presser plate 28 are fixed at this location.

  The dust-proof body 27 attached so as to close the ventilation holes 22, 23, 23 of the front grill 16 is pressed against the edge 16 d side of the front grill 16 by the pressing plate 28 at the outer peripheral portion of the ventilation portion 27 a. Thus, the periphery of the front grille 16 is in close contact with the edge 16d without partially floating. Further, the mounting holes 27b and 28b of the dustproof body 27 and the pressing plate 28 are fitted and inserted into the projections 16f and 16h of the front grille 16, and the dustproof body 27 and the pressing plate 28 are positioned. Therefore, some external force is applied to the dustproof body 27. Even if it acts, the vertical and lateral movement of the ventilation part 27a is blocked, and as a result, the positional displacement of the dustproof body 27 with respect to the ventilation holes 22, 23, 23 is prevented. A gap is prevented from being generated, and the dustproof property of the engine room can be ensured.

  Further, the dustproof body 27 and the holding plate 28 are fitted with the mounting holes 27b and 28b in the projections 16f and 16h of the front grille 16, and a retaining ring such as a push nut 29 is pushed into the tip of the projection 16f and fixed. Therefore, the dustproof body 27 and the presser plate 28, which are likely to occur when the screw is directly screwed to the front grill 16 through the mounting holes 27b and 28b of the dustproof body 27 and the presser plate 28, are caught in the screw, and It is possible to prevent the dustproof body 27 from being deformed and deteriorating the appearance.

  Note that the ventilation holes covered with the resin net are not limited to the ventilation holes 22, 23, 23 for introducing the cooling air shown in the embodiment, and for example, the ventilation holes for discharging the cooling air provided in the side cover 17. 17c may be used, and the dustproof body of the present invention can be similarly mounted when the bonnet hood 18 is provided with ventilation holes for introducing or discharging cooling air.

1 Work vehicle (tractor)
3 Engine 8 Radiator 15 Bonnet 16d Edge 16f Protrusion 16h Protrusion 22 Ventilation hole 23 Ventilation hole 27 Dustproof body 27a Ventilation portion 27b Mounting hole 28 Holding plate 28b Mounting hole 29 Push nut

Claims (2)

In a work vehicle comprising a ventilation hole for introducing or discharging cooling air to a hood covering an engine, a radiator, etc., and covering the ventilation hole with a dustproof body,
The dustproof body is composed of a resin net having a ventilation portion facing the ventilation hole and a large number of mounting holes drilled in the vicinity of the outer periphery of the ventilation portion.
The holding plate for preventing the dustproof body from lifting is configured by a resin plate having an opening facing the ventilation hole and a large number of mounting holes.
After attaching the mounting holes of the dustproof body and the pressing plate in that order to the numerous protrusions provided in the vicinity of the outer periphery of the ventilation hole on the back surface side of the bonnet, a retaining ring is inserted to connect the dustproof body and the pressing plate to the bonnet. Work vehicle characterized by being fixed to   2. The work vehicle according to claim 1, wherein a projection is provided in the vicinity of the outer periphery of the ventilation hole on the rear surface side of the bonnet so as to engage with the attachment hole of the dustproof body and the holding plate and prevent the lifting of these.

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