JP2004314782A - Engine hood structure of agricultural machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate size control of an engine hood structure while improving its rigidity. <P>SOLUTION: An engine hood structure 20 covering an upper region of an engine room 14 is constituted by a resin top plate 24 covering a top surface of the engine room 14, and metallic right and left side plates 26, 26 connected to the right and left sides of the top plate 24. A part of composing members is made of resin to have a light weight while an entire rigidity of the hood structure is being increased in such a way that a load is applied to an opening or closing direction of the hood structure 20. At this time, since the right and left side plates 26, 26 are made of metal, size control can be easily carried out in such a way that the lower ends of the right and left side plates 26, 26 are not warped inward or outward of the machine body. Due to this fact, the side plates 26 are neatly fitted to the fixing cover 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bonnet structure of an agricultural work machine such as a tractor, and more particularly to a bonnet structure of an agricultural work machine having a resin hood covering an upper part of an engine room.
[0002]
[Prior art]
In an agricultural work machine such as a tractor, for example, an engine room in which an engine, a radiator, and the like are installed is covered with a front grill on the front side and side covers on the left and right sides. 2. Description of the Related Art It is known that the upper part of an engine room is fixed to a frame and further covered with a resin bonnet that can be opened and closed up and down around a rear fulcrum (for example, see Patent Document 1).
[0003]
According to this conventional technique, since the bonnet is made of resin, the number of parts can be reduced, and the bonnet is lighter than metal and has improved operability when opening and closing the hood up and down.
[0004]
[Patent Document 1]
JP-A-2000-118446 (FIG. 1)
[0005]
[Problems to be solved by the invention]
However, according to Patent Document 1 described above, since the lower end of the resin bonnet is in a free state (free end) where it is not supported by other members, it is possible to accurately manage the size and shape of the lower end of the bonnet. It was difficult. For this reason, for example, when the resin bonnet is closed from the open state, a gap may be formed between the left and right side plates made of iron, or irregularities may occur in the contact portions between the bonnet and the left and right side plates, which may impair the aesthetic appearance. was there.
[0006]
The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a bonnet structure of a farm work machine which facilitates dimensional management while improving rigidity of the bonnet. is there.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is directed to a bonnet structure of an agricultural work machine (10) in which an upper part of an engine room (14) formed in a front part of the body is covered with a hood (20) that can be opened and closed. At
The hood (20)
A resin top plate (24) covering a top surface of the engine room (14);
Metal left and right side plates (26, 26) connected to the left and right sides of the top plate (24).
[0008]
According to a second aspect of the present invention, in the bonnet structure of the agricultural work machine according to the first aspect, the lower end portion of the top plate (24) and the upper end portions of the left and right side plates (26, 26) are overlapped with the fixing means (46). , 48), and a regulating plate (28) is fixed to the rear of the top plate (24) and the left and right side plates (26, 26), and the lower end of the regulating plate (28) is attached to the left and right side plates (26, 26). The left and right side plates (26, 26) are restricted from moving toward the inside of the machine by abutting on the lower end of (26).
[0009]
According to a third aspect of the present invention, in the bonnet structure of the agricultural working machine according to the first or second aspect, a fixing portion of the top plate (24) and the left and right side plates (26, 26) by the fixing means (46, 48). A mark sheet (47) is attached so as to hide the fixing means (46, 48) at the fixing portion.
[0010]
[Action]
As described above, according to the present invention, the hood (20) is formed by the resin top plate (24) and the metal left and right side plates (26, 26) connected to the left and right sides of the top plate (24). Since the load is applied in the opening and closing direction of the bonnet (20), the rigidity of the entire bonnet is increased, and a part of the constituent members is made of resin to reduce the weight and improve operability. Further, since the left and right side plates (26, 26) are made of metal, the dimensions of the left and right side plates (26, 26) can be easily controlled. For example, when the hood (20) is closed, the contact portion with the machine body side is formed. Match and the beauty is improved.
[0011]
In addition, the code | symbol in a parenthesis mentioned above is for contrast of drawing, and does not limit this invention at all.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
1 and 2 are views showing the appearance of a tractor to which the present invention is applied. The tractor 10 has a traveling body 13 supported by a front wheel 11 and a rear wheel 12, and has a front side. An engine room 14 for accommodating a mounted engine (not shown) is formed in the portion, and an upper portion of the engine room 14 is covered with a hood 20 that can be opened and closed vertically. A steering handle 15 for steering and a seat 17 and the like are disposed substantially at the center between the left and right fender frames 16 and 16 covering the rear wheel 12 in a steering section behind the hood 20. I have. Further, a safety frame 18 is attached to a rear portion of the seat 17.
[0014]
As shown in FIGS. 3 and 4, the hood 20 includes a resin top plate 24 that covers a top surface of the engine room 14, a resin front grill 25 connected to a front portion of the top plate 24, Left and right side plates 26, 26 made of iron are connected to the left and right sides of the top plate 24. As described above, by using the resin top plate 24 and the resin front grill 25 for the bonnet 20, the weight of the bonnet 20 is reduced, and the operability at the time of opening and closing up and down is improved. Wherein the upper portion of the front grille 25, outside air inlet of the grid-shaped (preparative outside air join the club) 33 _1, 33 ₂ are formed on the upper and lower stages, the translucent portion 34 to protect the front surface of the headlight 54 in the lower part Is formed.
[0015]
In the present embodiment, the front grill 25 is made of a transparent resin, and is coated with a predetermined color except for the light transmitting portion 34. A front cover 27 is attached below the front grill 25, and the left and right sides of the front cover 27 are attached to the front of the side plate 26. A reinforcing bracket 29 made of iron is mounted inside the center of the front cover 27 in the left-right direction. The reinforcing bracket 29 is fixed to the top plate 24 via a vertically extending iron plate 59 (see FIG. 5). I have. Further, a regulating plate 28 is attached around the inner periphery of the rear portion in a state where the top plate 24 and the left and right side plates 26, 26 are assembled.
[0016]
In addition, fixing means such as bolts and nuts are used for attaching these members. Further, in the present embodiment, the hood 20 that can be opened and closed up and down has been described as having the top plate 24, the front grill 25, and the left and right side plates 26 and 26, but is not limited thereto. The left and right side plates 26, 26 and the front grill 25 may be fixed to the machine body.
[0017]
As shown in FIG. 5, in this embodiment, the bonnet 20 is configured to be freely openable and closable about a rear fulcrum 21. When the bonnet 20 is closed downward, the bonnet 20 is attached to the front lower surface thereof. The reinforcing bracket 29 is in contact with the upper surface of the fixed cover 22 attached to the front of the fuselage. To the reinforcing bracket 29, an elongated iron plate 59 extending in the vertical direction substantially at the center inside the left and right directions of the front grill 25 is fixed. This iron plate 59 is fixed to the front grill 25 with a bolt / nut 57 at a middle part in the longitudinal direction, and is fixed to a front part of the top plate 24 with a bolt / nut 60 at the upper part.
[0018]
According to the present embodiment, each member (the top plate 24, the front grill 25, the side plate 26, and the like) constituting the bonnet 20 is applied with a load in the opening and closing direction (up and down direction) of the bonnet 20. Thus, the rigidity of the hood 20 itself can be increased. In addition, since the reinforcing bracket 29 is connected to the top plate 24, and the reinforcing bracket 29 has a function of abutting on the body when the bonnet 20 is closed, clearance management and the like during assembly can be facilitated. . Further, the components such as the top plate 24, the side plate 26, the front grill 25, and the front cover 27 can be accurately positioned by the fixing means, and together with the operation of the regulating plate 28 described later, the appearance after the components are assembled. Quality can be improved.
[0019]
Next, details of each member constituting the hood 20 will be described.
[0020]
As shown in FIGS. 6 and 7, the top plate 24 is formed by using polydicyclopantadiene which is a synthetic resin, and has a substantially flat planar upper surface having a slightly downwardly inclined front part. And left and right side portions that hang down slightly, and at the lower ends of the left and right side portions, a large number of bolt holes 44 are formed at the overlapping portion with the left and right side plates 26. Further, inside the upper surface portion, a plurality of bolt mounting seats (insert screw mounting seats) 30 for mounting the above-described front grille 25 and a regulating plate 28 described later are formed. The outer surface of the top plate 24 is appropriately coated with cream or the like or metal plated.
[0021]
As shown in FIGS. 8 and 9 (and FIG. 5), the front grill 25 is integrally formed using a transparent polycarbonate, and as described above, a lattice-shaped outside air intake 33 ₁ , 33 ₂ is formed, the light transmitting unit 34 to protect the front surface of the headlight 54 and GawaTeruto 55 (see FIG. 12) is formed in the lower portion. That is, the outside air intake 33 and the light transmitting portion 34 are integrally formed by the forming means. The front grill 25 is made of a transparent material (polycarbonate) having a high transmittance, and a portion other than the light transmitting portion 34 is coated with a cosmetic paint or metal plating. The light transmitting section 34 functions as a lens that emits light from a headlight 54 and a sidelight 55 described later.
[0022]
Further, on both left and right sides of the translucent section 34, light diffusing sections 41 for illuminating light from side lights 55, which will be described later, in a wide range toward the front and side of the fuselage are formed. The light diffusing portion 41 is formed of a light refracting portion formed in, for example, a sawtooth cross section on the inner surface of the light transmitting portion 34 so that light from the side lamp 55 can be diffused forward and sideward. Thus, the light emitted from the sidelight 55 can be illuminated over a wide area in front of and on the side of the fuselage, and a wide field of view on the left and right sides of the fuselage can be secured during nighttime work or the like. Further, on the inside of the front grill 25, there are formed a tongue piece 32 having a large number of bolt mounting seats 31 and holes for mounting to the top plate 21, and a hole 53 'for mounting to a reflector portion 35 described later. A tongue piece 32 'and the like are formed. According to the present embodiment, since the material of the front grill 25 is made of polycarbonate, the strength of the front grill 25 can be increased despite being a synthetic resin.
[0023]
FIGS. 10 and 11 show a reflector section 35 attached to the inside of the light transmitting section 34. This reflector section 35 is formed by molding polypropylene, and has openings 36, 36 adjacent to the center in the left-right direction. The headlight 54 is attached to the opening 36 so that the optical axis can be adjusted. Further, concave curved portions 37, 37 are formed on the left and right sides of the openings 36, 36 in the reflector portion 35. A side illumination 55 is mounted substantially at the center of the curved portion 37. The surface of the reflector section 35 is coated with aluminum to reflect light. In the upper and lower portions of the reflector portion 35, upstanding pieces 38, 39 for mounting the reflector portion 35 to the front grill 25, bolt mounting holes 40, and tongue pieces 32 having mounting holes 53 "formed therein. Is formed.
[0024]
FIG. 12 is a cross-sectional plan view showing a state in which the headlight 54 and the sidelight 55 are attached to the reflector section 35. The headlights 54, 54 are attached to the center of the body in the left-right direction. , 54 are provided with side illuminators 55, 55 side by side. The headlight 54 has an external appearance as shown in FIG. 13, and three screw holes 58 for attachment to the reflector part 35 are formed on the outer peripheral portion thereof. The headlight 54 has a lens 56 and a light bulb 61 disposed on the front surface, and a conical reflection surface 52 (see FIG. 12) covering the rear surface of the light bulb 61.
[0025]
As described above, a concave curved portion 37 whose trajectory of the cross section is indicated by a dashed line (a-a) in the drawing is formed on each of the left and right sides of the reflector portion 35. A side light 55 is attached substantially at the center of 37. The curved portion 37 is coated with aluminum so as to reflect light. With this configuration, the irradiation angle of the sidelight 55 is in a range of approximately 50 ° from the front of the fuselage to the side in plan view. It has become. Thus, according to the side illumination 55, the curved portion 37 and the effect of the light diffusion portion 41 described above are combined, so that illumination can be performed over a wider range. Further, the curved portion 37 also serves as a partition rib for preventing the light of the sidelight 55 from leaking to the headlight 54 side.
[0026]
FIG. 14 is a cross-sectional side view showing a state in which a headlamp 54 is attached to the front grill 25 via a reflector unit 35. That is, the reflector section 35 is attached to the front grill 25 with the upper bolt and nut 57 and the lower bolt and nut 62. FIG. 15 shows a state in which the headlight 54 is attached to the opening 36 of the reflector 35 so that the optical axis can be adjusted. In other words, the headlamp 54 moves the three upper and lower bolts 63 ₁ , 63 ₂ , 63 ₃ and nuts 64 ₁ , 64 ₂ , 64 ₃ , and the headlamp 54 arranged around the opening 36 to the rear of the machine. It is attached by springs 65 ₁ , 65 ₂ , 65 ₃ that are always energized. Therefore, by adjusting the upper two bolts 63 ₁ and 63 ₂ and the lower one bolt 63 ₃ , the optical axis of the headlight 54 can be arbitrarily adjusted up and down. The optical axis can be adjusted substantially constant at the time of shipment from the factory.
[0027]
As shown in FIG. 16, the front cover 27 is integrally formed of polypropylene in the present embodiment, and has standing pieces 42, 42 'for mounting to the front grill 25 and bolt mounting holes at the upper part. 43 are formed, and the surface of the front cover 27 is also painted or metal-plated.
[0028]
Next, as shown in FIG. 17, the left and right side plates 26 are manufactured by processing a single iron plate, and have an elongated shape in the front and rear of the fuselage. A large number of bolts (fixing means) 46 projecting inward from the side plate 26 by welding means are implanted in the overlapping portion with the lower end of the top plate 21. In this overlapping portion, the top plate 21 and the side plate 26 are integrally fixed by the bolts (fixing means) 46 and the nuts (fixing means) 48 (see FIG. 18). Further, the regulating plate 28 is fastened and fixed together by a rearmost bolt 46 and a nut 48 for fixing the top plate 21 and the side plate 26 (see FIG. 18). Further, a mark sheet 47 is attached to the overlapping portion so as to cover the head of the bolt 46. The mark sheet 47 is attached mainly for the purpose of enhancing the function of notifying the manufacturer or enhancing the beauty. A tongue piece 45 is formed at a front end of the side plate 26 at a portion where the side plate 26 is attached to the front grill 25.
[0029]
As shown in FIG. 18, at the rearmost portion inside the top plate 24 and the left and right side plates 26, the regulation plate 28 extending along the inner periphery of the top plate 24 and the left and right side plates 26 is provided. It is fixed by a bolt 49 and the nut 48. Further, an elastic rubber (not shown) is attached to a lower end of the regulating plate 28, and an inner lower end 26a of the side plate 26 is in contact with the elastic rubber. In this way, the regulating plate 28 regulates the movement of the side plate 26 into the inside of the machine, and has a function of positioning the side plate 26 in the lateral direction of the machine. Thereby, the bonnet 20 is closed downward from the state opened upward, and when the lower end of the bonnet 20 contacts the upper surface of the fixed cover 22, the position of the side plate 26 and the fixed cover 22 in the left-right direction is determined. However, it is designed to match exactly.
[0030]
FIG. 19 is an external view of the assembled bonnet 20 as viewed from below. Inside the outside air intake 33 of the front grill 25, a wire mesh 50 having a large number of meshes as shown in FIG. It is stretched by a bolt inserted into the hole 51. The wire mesh 50 cools the engine by taking in outside air into the bonnet 20 from the outside air intake 33, while preventing straw and dust from entering the bonnet 20 from the outside air intake 33.
[0031]
As shown in FIG. 21, the fixed cover 22 is fixed to the front portion of the body frame and is formed by integrally molding synthetic resin. Although not shown, the fixed cover 22 has a bolt hole for attachment to the body front portion. An exhaust hole 23 for the muffler is formed on one side. The lower surface of the reinforcing bracket 29 attached to the lower portion of the hood 20 is in contact with the upper surface of the fixed cover 22.
[0032]
【The invention's effect】
According to the invention according to claim 1, the hood is constituted by a resin top plate that covers the top surface of the engine room, and metal left and right side plates connected to left and right side portions of the top plate. Since a load is applied to each component of the bonnet in the opening and closing direction of the bonnet, rigidity can be increased.
[0033]
According to the invention according to claim 2, the lower end of the top plate and the upper end of the left and right side plates are overlapped and fixed by the fixing means, and the regulating plate is fixed to the rear portions of the top plate and the left and right side plates. Since the lower end of the plate is brought into contact with the lower end of the left and right side plates to restrict the movement of the left and right side plates into the inside of the machine, the rigidity of the bonnet end is increased and the dimensional control becomes possible. When the hood is closed, the appearance of the hood and the fixing cover on the fuselage side can be maintained beautifully.
[0034]
According to the third aspect of the present invention, since the mark sheet is attached to the fixing portion between the top plate and the left and right side plates by the fixing means so as to hide the fixing means at the fixing portion, the appearance quality after assembling the parts is improved. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a side view of a tractor to which the present invention is applied.
FIG. 2 is a front view of the same.
FIG. 3 is an exploded perspective view of a bonnet.
FIG. 4 is an external perspective view of a bonnet.
FIG. 5 is a cross-sectional side view showing a state when the hood is opened and a state when the hood is closed.
FIG. 6 is a rear view of the top plate.
FIG. 7 is a side view of the top plate.
FIG. 8 is an external view from the front of the front grill.
FIG. 9 is an external view of the front grill seen from the back.
FIG. 10 is an external view of a reflector unit.
FIG. 11 is a side view of a reflector unit.
FIG. 12 is a cross-sectional plan view of a front grill.
FIG. 13 is an external view of a headlight.
FIG. 14 is a cross-sectional side view of the front grill.
FIG. 15 is a cross-sectional plan view of a headlight mounting portion.
FIG. 16 is an external view of a front cover.
FIG. 17 is a front view of a side plate.
18 is a sectional view taken along line AA of FIG.
FIG. 19 is an external view of the bonnet viewed from below.
FIG. 20 is an external view of a wire mesh.
FIG. 21 is an external view of a fixed cover.
[Explanation of symbols]
Reference Signs List 10 Tractor 20 Bonnet 24 Top plate 26 Left right plate 28 Restriction plate 46 Bolt (fixing means)
47 mark sheet 48 nut (fixing means)

Claims (3)

In the bonnet structure of the farm work machine, the upper part of the engine room formed in the front of
The hood,
A resin top plate that covers the top surface of the engine room,
Metal left and right plates connected to the left and right sides of the top plate,
A bonnet structure for an agricultural work machine, characterized in that: The lower end of the top plate and the upper end of the left and right side plates are overlapped and fixed by fixing means, and a regulating plate is fixed to the rear of the top plate and the left and right side plates, and the lower end of the regulating plate is fixed to the left and right side plates. The right and left side plates were restricted from moving toward the inside of the aircraft by contacting the lower ends of the
The bonnet structure of an agricultural work machine according to claim 1, wherein: A mark sheet was stuck to a fixing part of the top plate and the left and right side plates by the fixing means so as to hide the fixing means of the fixing part,
The bonnet structure for an agricultural work machine according to claim 1 or 2, wherein:

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