JP2016013719A - Engine hood of tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine hood of a tractor which enables an upper cover and a front grille to be used in at least two models by changing length of a skirt part in a lower cover.SOLUTION: An engine hood 2 of a tractor 1 includes: an upper cover 21; a front grille 23 disposed at the lower side of a front part of the upper cover 21; and a lower cover 22 (22A, 22B) disposed at the lower side of a side part of the upper cover 21. The upper cover 21 and the front grille 23 may be used in at least two models by changing length of a skirt part 22S in the lower cover 22 (22A, 22B).

Description

  The present invention relates to a tractor bonnet.

  Conventionally, a tractor used in farmland is known (for example, Patent Document 1). Such a tractor is provided with a bonnet at the front, and an engine is housed in the bonnet. The bonnet has an upper cover, a front grille, and a lower cover.

  By the way, the size of the engine is different for each model of the tractor. Therefore, in the past, the components of the bonnet were different for each model. Therefore, there is a problem in that the production amount of the component parts does not increase and cost reduction cannot be expected. Accordingly, there has been a demand for a tractor bonnet that can be used in at least two models by changing the length of the skirt portion of the lower cover for the upper cover and the front grille.

JP 2010-163036 A

  An object of the present invention is to provide a tractor bonnet that can be used in at least two models by changing the length of the skirt portion of the lower cover for the upper cover and the front grille.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

The invention according to claim 1
An upper cover,
A front grill disposed below the front portion of the upper cover;
In the hood of the tractor having a lower cover disposed below the side of the upper cover,
The upper cover and the front grille can be used in at least two models by changing the length of the skirt portion in the lower cover.

The invention according to claim 2 is the bonnet according to claim 1,
Comprising an under spacer disposed below the front grille,
If the skirt is long,
The lower cover is configured such that its lower side is in contact with a virtual line extending from the lower side of the under spacer.

The invention according to claim 3 is the bonnet according to claim 1,
If the skirt is short,
The lower cover has a lower side that is in contact with a virtual line extending from the lower side of the front grill.

The invention according to claim 4 is the bonnet according to claim 2,
The under spacer is provided with one or more through holes.

The invention according to claim 5
A tractor comprising the bonnet according to any one of claims 1 to 4.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, the upper cover and the front grill can be shared by at least two models by changing the length of the skirt portion in the lower cover. As a result, the bonnet can be reduced in cost by the mass production effect of the upper cover and the front grille.

  According to the second aspect of the present invention, when the skirt portion is long, the lower cover is in contact with a virtual line whose lower side extends from the lower side of the under spacer. As a result, such a bonnet can be adapted to a model equipped with a large engine without impairing the appearance, and can also be used as an upper cover and a front grille.

  According to the third aspect, when the skirt portion is short, the lower cover is in contact with an imaginary line whose lower side extends from the lower side of the front grille. As a result, such a bonnet can be applied to a model equipped with a small engine without impairing the appearance, and can also be used as an upper cover and a front grille.

  According to the fourth aspect, the under spacer is provided with one or a plurality of through holes. Thereby, in such a bonnet, the under spacer becomes a ventilation path, so that the heat of the engine is hardly accumulated.

  According to a fifth aspect of the present invention, a tractor according to the present invention includes the bonnet according to any one of the first to fourth aspects. As a result, the tractor is superior to the conventional tractor in terms of the above points.

The figure which shows a tractor. The figure seen from the arrow X of FIG. The figure seen from the arrow Y of FIG. The figure seen from the arrow Z of FIG. The figure which shows a bonnet. The figure seen from the arrow X of FIG. The figure seen from the arrow Y of FIG. The figure seen from the arrow Z of FIG. The figure which shows a center mark and a design panel. The figure seen from the arrow X of FIG. The figure seen from the arrow Y of FIG. The figure seen from the arrow Z of FIG. The figure which shows a visual field of an operator. The figure which shows an operator's eyes | visual_axis. The figure which shows the removal | desorption work of a design panel. The figure which shows the flow of the air in a bonnet. The figure which shows the assembly process of a bonnet. The figure which shows the assembly process of a bonnet. The figure which shows the assembly process of a bonnet. The figure which shows the assembly process of a bonnet. The figure which shows the assembly process of a bonnet. The figure which shows the assembly process of a bonnet. The figure which shows the assembly process of a bonnet. The figure which shows the assembly process of a bonnet. The figure which shows the assembly process of a bonnet. The figure which shows the state which the bonnet was completed. The figure seen from the arrow M of FIG. The figure seen from the arrow N of FIG. The figure which shows the AA cross section of FIG. The figure which shows the state which opened the bonnet. The figure which shows the state which closed the bonnet. The figure which expanded the area | region P in FIG. The figure which shows the scene which looked at the bonnet of the closed state from the cabin. The figure which shows two lower covers. The figure which shows the process of attaching a lower cover. The figure which shows the process of attaching a lower cover. The figure which shows the state which each bonnet completed.

  The technical idea of the present invention can be applied to any agricultural machine vehicle or construction machine vehicle.

  First, the tractor 1 will be briefly described.

  FIG. 1 shows a tractor 1. 2 is a view as seen from the arrow X in FIG. 1, and FIG. 3 is a view as seen from the arrow Y in FIG. FIG. 4 is a view seen from the arrow Z in FIG. In addition, in the figure, the front-back direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  The tractor 1 mainly includes a chassis frame 11, an engine 12, a transmission 13, a front axle 14, and a rear axle 15. The tractor 1 is provided with a hood 2 that protects the engine 12 from wind and rain, as well as a cabin 16 that protects the operator from wind and rain.

  The chassis frame 11 forms the skeleton of the tractor 1. The engine 12 and the like described below are attached to the chassis frame 11.

  The engine 12 converts thermal energy obtained by burning fuel into kinetic energy. That is, the engine 12 generates rotational power by burning fuel. A control device is connected to the engine 12. When the operator operates the accelerator pedal, the control device changes the operating state of the engine 12 according to the operation. Further, the engine 12 is provided with an exhaust purification device 12E. The exhaust purification device 12E oxidizes particles (PM), carbon monoxide (CO), and hydrocarbons (HC) contained in the exhaust.

  The transmission 13 transmits the rotational power of the engine 12 to the front axle 14 and the rear axle 15. The rotational power of the engine 12 is input to the transmission 13 via a coupling mechanism. The transmission 13 is provided with a continuously variable transmission. When the operator operates the shift lever, the continuously variable transmission changes the operating state of the transmission 13 according to the operation.

  The front axle 14 transmits the rotational power of the engine 12 to the front tire 141. The rotational power of the engine 12 is input to the front axle 14 via the transmission 13. The front axle 14 is provided with a steering device. When the operator operates the steering wheel, the steering device changes the steering angle of the front tire 141 according to the operation.

  The rear axle 15 transmits the rotational power of the engine 12 to the rear tire 151. The rotational power of the engine 12 is input to the rear axle 15 via the transmission 13. The rear axle 15 is provided with a PTO output device. When the operator operates the switch, the PTO output device inputs rotational power to the towing work machine.

  Next, the bonnet 2 will be described.

  FIG. 5 shows the bonnet 2. 6 is a view seen from an arrow X in FIG. 5, and FIG. 7 is a view seen from an arrow Y in FIG. FIG. 8 is a view seen from an arrow Z in FIG. In addition, in the figure, the front-back direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  The bonnet 2 has an upper cover 21 and a pair of lower covers 22. The bonnet 2 has a front grille 23 on the front surface thereof.

  The upper cover 21 is an exterior part that covers the upper side of the engine 12. The upper cover 21 rises upward from the front end point Ua and is folded downward from the middle point Ub. A smooth curve is drawn from the opening 21h to the rear end point Uc. Further, the upper cover 21 extends laterally from the front end point Ua, and draws a smooth curve with the side end point Uw as the maximum width portion. In the upper cover 21, a character line C1 is formed from the front end point Ua to the middle point Ub, and a character line C2 is formed so as to spread laterally from the middle point Ub. The opening 21h is formed in a substantially wedge shape between the two character lines C2. The opening 21h is closed by the design panel 41.

  The lower cover 22 is an exterior part that covers the side of the engine 12. The lower cover 22 extends from the front end point La to the side and draws a smooth curve with the side end point Lw as the maximum width portion. Furthermore, the upper half of the lower cover 22 is based on a curved surface that bulges outward, whereas the lower half of the lower cover 22 is based on a curved surface that is recessed inward. In the lower cover 22, a character line C3 passing from the front end point La to the side end point Lw is formed. The opening 22ha is formed in a substantially rhombus shape above the character line C3, and the opening 22hb is formed in a substantially rhombus shape below the character line C3. In addition, the front upper portion of the lower cover 22 is formed in accordance with the shape of the high beam light unit 24. Further, the lower part on the front side of the lower cover 22 is formed in accordance with the shape of the low beam light unit 25.

  The front grill 23 is an exterior part that covers the front of the engine 12. The front grill 23 has a structure in which a metal mesh 232 is bonded to a grill frame 231. The grill frame 231 includes beam portions 231L and 231R extending obliquely upward from the predetermined point Sp, and pillar portions 231P extending downward from the predetermined point Sp. The beam portions 231L and 231R and the pillar portion 231P are gradually narrowed away from the predetermined point Sp and connected to the frame portion 231G. In addition to the range surrounded by the beam portions 231L and 231R and the frame portion 231G, the metal mesh 232 includes the range surrounded by the beam portion 231L, the pillar portion 231P, and the frame portion 231G, and the beam portion 231R, the pillar portion 231P, and the frame portion 231G. It covers three places in the range surrounded by. In addition, the upper both sides of the front grille 23 are formed in accordance with the shape of the high beam light unit 24. Further, both sides of the lower portion of the front grill 23 are formed in accordance with the shape of the low beam light unit 25.

  Furthermore, this bonnet 2 has the following characteristics. That is, a substantially I-shaped center mark 31 is arranged on the upper cover 21 so as to cut the opening 21h vertically. In addition, a substantially Y-shaped symbol mark 32 is arranged on the front surface of the front grill 23 so as to cover the beam portions 231L and 231R and the pillar portion 231P. The center mark 31 and the symbol mark 32 are subjected to a glossy plating process. The purpose of this is to incorporate an excellent design and enhance the visibility by giving a strong impression to a third party.

  Next, the center mark 31 and the design panel 41 will be described in detail.

  FIG. 9 shows the center mark 31 and the design panel 41. 10 is a view seen from the arrow X in FIG. 9, and FIG. 11 is a view seen from the arrow Y in FIG. FIG. 12 is a view as seen from an arrow Z in FIG. In addition, in the figure, the front-back direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  In the tractor 1, the center mark 31 is fixed to the design panel 41. More specifically, the center mark 31 is fixed to the design panel 41 so that the center line 31L and the center line 41L of the design panel 41 overlap (see FIG. 12). Therefore, the center mark 31 is arranged so as to overlap the center line 2L of the bonnet 2 when the design panel 41 is attached at a predetermined position (see FIG. 8). Eventually, the tractor 1 is disposed so as to overlap the center line 1L (see FIG. 4).

  In the tractor 1, the center mark 31 is a metal forming part. The center mark 31 draws a curve that rises upward from the front end point Ca and gradually becomes gentle toward the middle point Cb. Then, behind the middle point Cb, an arcuate curve descending downward toward the rear end point Cc is drawn. That is, the ridgeline 31R from the front end point Ca to the rear end point Cc describes an arc that swells upward. The ridgeline 31R is formed by two curved surfaces 31Sa and 31Sb that descend from the ridgeline 31R to the left and right. Therefore, when the center mark 31 is viewed from the cabin 16, the center mark 31 looks like a sharp shape upward (see FIG. 13).

  In the tractor 1, the design panel 41 is a resin-formed component. The design panel 41 swells upward from the front end point Da and draws a gentle curve from the rear end point Db. Furthermore, the design panel 41 has a substantially wedge shape spreading laterally from the front end point Da. The design panel 41 is provided with a plurality of latching claws 41C on the back side. Therefore, the design panel 41 is attached in a state where the hooking claw 41 </ b> C is hooked on the opening 21 h of the upper cover 21. In addition, the design panel 41 is provided with a plurality of through holes 41h. Therefore, the design panel 41 can pass air from the inside of the bonnet 2 to the outside or from the outside to the inside (see FIG. 16).

  Next, the function of the center mark 31 will be described.

  FIG. 13 shows the field of view of the operator. FIG. 14 shows the line of sight of the operator. The two-dot chain line DH represents the line of sight of an operator with a high height, and the two-dot chain line DL represents the line of sight of an operator with a short height.

  As described above, the center mark 31 is disposed so as to overlap the center line 1L of the tractor 1. Therefore, the center mark 31 always indicates the traveling direction of the tractor 1 when viewed from the operator. Therefore, the operator can determine the traveling direction by maneuvering so that the center mark 31 overlaps the target route Tr. Note that since the center mark 31 looks like a shape pointed upward, it can be easily overlapped even if the width of the target route Tr is narrow. For example, even if a narrow gap between 畝 r and 畝 r is the target route Tr, it is easy to overlap.

  Further, the operator can recognize that the traveling direction has shifted when the center mark 31 deviates from the target route Tr. At this time, the operator can appropriately correct the deviation in the traveling direction by manipulating the center mark 31 again on the target route Tr. Since the center mark 31 looks like a sharp point upward, it can be easily understood that the center mark 31 has been removed even if the width of the target route Tr is narrow. For example, even if a narrow gap between 畝 r and 畝 r is the target route Tr, it is easy to understand that the center mark 31 has been removed.

  As described above, the bonnet 2 according to the present invention includes the center mark 31 disposed on the upper cover 21. The center mark 31 serves as a sight for the operator to determine the traveling direction. Thereby, the tractor 1 provided with the bonnet 2 can easily determine the traveling direction and can appropriately correct the deviation in the traveling direction. Accordingly, the tractor 1 can be easily operated.

  In addition, the operator gets on the extension line of the center mark 31 in the tractor 1. Therefore, it can be said that the center mark 31 is arranged along the line of sight of the operator who looks at the target route Tr. Therefore, the operator can see the center mark 31 with a natural posture. The center mark 31 is drawn in an arc in which the ridge line 31R bulges upward, so that it looks sharply upward even when the angle at which the center mark 31 is viewed is different. Specifically, the center mark 31 looks like a pointed shape with the point Ra as a vertex for an operator with a high height, and looks like a pointed shape with a point Rb as a vertex for an operator with a short height.

  As described above, the center mark 31 is arranged along the line of sight of the operator looking at the target route Tr. And the ridgeline 31R draws an arc that swells upward. As a result, the tractor 1 including the bonnet 2 can easily capture the target route Tr on the extension line of the center mark 31 regardless of the height of the operator.

  Next, other functions of the center mark 31 will be described.

  FIG. 15 shows the detaching operation of the design panel 41. The detachment work refers to a removal work and a mounting work during maintenance as well as a mounting work during manufacturing.

  As described above, the center mark 31 is fixed to the design panel 41. Further, the design panel 41 is attached in a state where the latching claw 41C is hooked on the opening 21h of the upper cover 21. Therefore, the center mark 31 and the design panel 41 are detachable with respect to the upper cover 21 in an integrated state. At this time, the operator can pick up the center mark 31 and perform the detaching work.

  Thus, the bonnet 2 according to the present invention includes the design panel 41 that closes the opening 21h. The center mark 31 is fixed to the design panel 41. As a result, the tractor 1 provided with the bonnet 2 has the center mark 31 as a handle, so that the design panel 41 can be easily attached and detached.

  In addition, the tractor 1 provided with the bonnet 2 has the center mark 31 as a handle, so that the work efficiency at the time of manufacture and maintenance is improved. Even if the center mark 31 or the design panel 41 is damaged, it can be easily replaced. Furthermore, even when the center mark 31 or the design panel 41 is dirty, it can be easily cleaned.

  Next, functions of the design panel 41 will be described.

  FIG. 16 shows the air flow in the bonnet 2. In addition, the arrow Fa * Fb in a figure represents the flow of the air supplied to the bonnet 2, and the arrow Fc * Fd in the figure represents the flow of the air discharged | emitted from the bonnet 2. FIG.

  As described above, the design panel 41 is provided with a plurality of through holes 41h. Therefore, the design panel 41 can pass air from the inside of the bonnet 2 to the outside or from the outside to the inside. In the present design panel 41, the through hole 41h is a round hole with a small diameter (round hole with a diameter of 2 mm), but is not limited thereto. For example, a square hole or a triangular hole may be used. Further, the number of through holes 41h may be one or plural. That is, the design panel 41 only needs to allow air to pass through.

  Thus, the design panel 41 is provided with one or a plurality of through holes 41h. Thereby, since the design panel 41 becomes a ventilation path, the tractor 1 provided with the bonnet 2 is less likely to trap the heat of the engine 12.

  In addition, in the tractor 1 provided with the bonnet 2, the design panel 41 serves as an air passage, so that the heat balance performance of the engine 12 is improved. As a result, the lubricating oil temperature is properly maintained and the durability of the engine 12 is improved. In addition, the fuel temperature is maintained appropriately, and the output of the engine 12 can be prevented from decreasing. The design panel 41 is designed with elaborate design. The purpose of this is to incorporate an excellent design and enhance the visibility by giving a strong impression to a third party.

  Below, the structure of the bonnet 2 is demonstrated.

  17 to 25 show the assembly process of the bonnet 2. FIG. 26 shows a state where the bonnet 2 is completed. 27 is a view seen from the arrow M in FIG. 26, and FIG. 28 is a view seen from the arrow N in FIG. Furthermore, FIG. 29 has shown the AA cross section of FIG. Here, only main steps will be described. Further, the order of the steps is not limited.

  The first step is a step of attaching the side frame 52 and the under spacer 53 to the center pillar 51 (see FIG. 17). More specifically, it is a step of attaching the side frame 52 to the center pillar 51 and attaching the under spacer 53 to the side frame 52. The side frame 52 is fixed to the lower end of the center pillar 51 using a bolt 52B. The under spacer 53 is fixed to the lower surface of the side frame 52 using bolts 53B.

  The second process is a process of attaching the front grill 23 and the symbol mark 32 to the module M1 assembled in the first process (see FIG. 18). More specifically, it is a step of attaching the front grill 23 to the center pillar 51 and attaching the symbol mark 32 to the front grill 23. The front grill 23 is fixed to the front surface of the center pillar 51 using bolts 23B. The symbol mark 32 is fixed to the front surface of the front grille 23 using bolts 32B.

  The third step is a step of attaching the high beam light unit 24 and the low beam light unit 25 to the module M2 assembled in the second step (see FIG. 19). More specifically, it is a step of attaching the high beam light unit 24 to the front grill 23 and attaching the low beam light unit 25 to the front grill 23. The high beam light unit 24 is fixed to the back surface of the front grille 23 using bolts 24B. The low beam light unit 25 is also fixed to the back surface of the front grille 23 using bolts 25B. The low beam light unit 25 is also fixed to the rear surface of the high beam light unit 25 using screws 25S.

  The fourth step is a step of attaching the chip member 61, the middle member 62, and the end member 63 to the upper cover 21 (see FIG. 20). More specifically, the chip member 61 is attached to the upper cover 21, the middle member 62 is attached to the upper cover 21, and the end member 63 is attached to the upper cover 21. The chip member 61 is fixed to the back surface of the distal end portion of the upper cover 21 using an adhesive. The middle member 62 is fixed to the middle back surface of the upper cover 21 using an adhesive and a fastener 62F (see FIG. 29). The end member 63 is fixed to the rear surface of the rear end portion of the upper cover 21 using an adhesive and a fastener 63F (see FIG. 29). A center beam 631 is welded to the end member 63 in advance. The center beam 631 is fixed to the lower surface of the middle member 62 using bolts 631B.

  The fifth step is a step of attaching the support plate 64 and the bonnet hinge 65 to the module M4 assembled in the fourth step (see FIG. 21). More specifically, it is a process of attaching the support plate 64 to the upper cover 21 and attaching the bonnet hinge 65 to the end member 63. The support plate 64 is fixed to the rear surface of the rear end portion of the upper cover 21 using an adhesive and a fastener 64F (see FIG. 27). The bonnet hinge 65 is fixed to the lower surface of the end member 63 using bolts 65B. The bonnet hinge 65 is also fixed to the lower surface of the center beam 631 using bolts 65B.

  The sixth step is a step of combining the module M3 assembled in the third step and the module M5 assembled in the fifth step (see FIG. 22). More specifically, it is a step of connecting the center pillar 51 constituting the module M3 and the chip member 61 constituting the module M5 to form one module M6. The center pillar 51 and the chip member 61 are connected using a bolt 51B.

  The seventh step is a step of attaching the lower cover 22 to the module M6 assembled in the sixth step (see FIG. 23). More specifically, it is a process of attaching the lower cover 22 to the upper cover 21, the side frame 52, the end member 63, and the like. The lower cover 22 is fixed to the upper cover 21, the side frame 52, and the end member 63 using fasteners 22F. The lower cover 22 is also fixed to the high beam light unit 24 using nuts 22N (see FIG. 29). The lower cover 22 is also fixed to the low beam light unit 25 using fasteners 22F (see FIG. 29). Further, the lower cover 22 is also fixed to the under spacer 53 using fasteners 22F (see FIGS. 28 and 29).

  The eighth step is a step of attaching the weather strips 66, 67, 68, and 69 to the module M7 assembled in the seventh step (see FIG. 24). More specifically, it is a step of attaching weather strips 66, 67, 68, and 69 to the under spacer 53, the lower cover 22, the end member 63, and the like. The weather strip 66 is fitted into the lower side of the under spacer 53 and the lower cover 22. The weather strip 67 is fitted into a rib inside the lower cover 22. Furthermore, the weather strip 68 is fitted into the rear side of the end member 63 (only on the right side of the bonnet hinge 65). The weather strip 69 is fitted into the rear side of the support plate 64 (only on the left side of the bonnet hinge 65).

  The ninth step is a step of attaching the design panel 41 to the module M8 assembled in the eighth step (see FIG. 25). More specifically, it is a process of attaching the design panel 41 to the opening 21 h of the upper cover 21. As described above, the design panel 41 is attached in a state where the latching claw 41C is hooked on the opening 21h of the upper cover 21. A center mark 31 is fixed to the design panel 41 in advance.

  Thus, the bonnet 2 is completed (see FIGS. 26, 27, 28, and 29).

  Next, structural features of the bonnet 2 will be described.

  As a first feature, the bonnet 2 has a center pillar 51. The center pillar 51 is an assembly standard for each component or component group (in the above, referred to as “module”) constituting the bonnet 2. A side frame 52 and the like described below are attached directly or indirectly to the center pillar 51.

  As a second feature, the side frame 52 is attached to the center pillar 51 (see FIG. 17). That is, the side frame 52 is directly attached to the center pillar 51 which is an assembly standard.

  As described above, the bonnet 2 according to the present invention has the side frames 52. The side frame 52 is attached to the center pillar 51. As a result, the bonnet 2 is less likely to shift the mounting position of the side frame 52 with respect to the center pillar 51, and the assembly accuracy is improved.

  As a third feature, the under spacer 53 is attached to the side frame 52 (see FIG. 17). More specifically, the bonnet 2 has a side frame 52 attached to a center pillar 51 that is an assembly standard. The under spacer 53 is attached to the side frame 52. That is, the under spacer 53 is indirectly attached to the center pillar 51 which is an assembly reference.

  Thus, the bonnet 2 according to the present invention has the under spacer 53. The under spacer 53 is attached to the side frame 52. As a result, the bonnet 2 is less likely to shift the mounting position of the under spacer 53 with respect to the side frame 52, and the assembly accuracy is improved. As a result, the mounting position of the under spacer 53 is not easily displaced with respect to the center pillar 51, and the assembly accuracy is improved. The under spacer 53 may be directly attached to the center pillar 51. Even in this case, the same effect is obtained.

  As a fourth feature, the front grille 23 is attached to the center pillar 51 (see FIG. 18). That is, the front grille 23 is directly attached to the center pillar 51 which is an assembly standard.

  Thus, the bonnet 2 according to the present invention has the front grille 23. The front grill 23 is attached to the center pillar 51. As a result, the bonnet 2 is less likely to shift the mounting position of the front grille 23 with respect to the center pillar 51, and the assembly accuracy is improved.

  As a fifth feature, the high beam light unit 24 and the low beam light unit 25 are attached to the front grille 23 (see FIG. 19). More specifically, the bonnet 2 has a front grille 23 attached to a center pillar 51 that is an assembly standard. The high beam light unit 24 and the low beam light unit 25 are attached to the front grille 23. That is, the high beam light unit 24 and the low beam light unit 25 are indirectly attached to the center pillar 51 which is an assembly reference.

  Thus, the bonnet 2 according to the present invention includes the light units (the high beam light unit 24 and the low beam light unit 25). The light units (24, 25) are attached to the front grille 23. As a result, the bonnet 2 is less likely to shift the mounting position of the light unit (24/25) with respect to the front grille 23, and the assembly accuracy is improved. As a result, the mounting position of the light unit (24, 25) is not easily displaced with respect to the center pillar 51, and the assembly accuracy is improved. The light units (24, 25) may be directly attached to the center pillar 51. Even in this case, the same effect is obtained.

  As a sixth feature, the upper cover 21 is supported by the center pillar 51 (see FIG. 22). That is, the upper cover 21 is directly supported by the center pillar 51 that is an assembly reference.

  Thus, the bonnet 2 according to the present invention has the upper cover 21. The upper cover 21 is supported by the center pillar 51. As a result, the bonnet 2 is less likely to shift the mounting position of the upper cover 21 with respect to the center pillar 51, and the assembly accuracy is improved.

  As a seventh feature, the lower cover 22 is attached to at least the upper cover 21 and the side frame 52 (see FIG. 23). More specifically, in the bonnet 2, the upper cover 21 is supported by the center pillar 51 which is an assembly standard. Further, a side frame 52 is attached to the center pillar 51 which is an assembly standard. The lower cover 22 is attached to at least the upper cover 21 and the side frame 52. That is, the lower cover 22 is indirectly attached to the center pillar 51 which is an assembly standard.

  Thus, the bonnet 2 according to the present invention has the lower cover 22. The lower cover 22 is attached to the upper cover 21 and the side frame 52. As a result, the bonnet 2 is less likely to shift the mounting position of the lower cover 22 with respect to the upper cover 21 and the side frame 52, and the assembly accuracy is improved. As a result, the mounting position of the lower cover 22 is not easily displaced with respect to the center pillar 51, and the assembly accuracy is improved. In the bonnet 2, the lower cover 22 is also attached to the light units (24 and 25) and the under spacer 53. This is to increase the rigidity of the lower cover 22.

  Below, the structure which made the bonnet 2 openable and closable is demonstrated.

  FIG. 30 shows a state where the bonnet 2 is opened. FIG. 31 shows a state where the bonnet 2 is closed. FIG. 32 is an enlarged view of a region P in FIG. FIG. 33 shows a scene where the operator looks at the hood 2 in the closed state.

  An air cut plate 26 is housed inside the bonnet 2. The air cut plate 26 is disposed so as to close the rear end of the bonnet 2, and prevents heat and noise from the engine 12 from being transmitted to the cabin 16. The air cut plate 26 has a role of supporting the bonnet hinge 65.

  Further, a side beam 27 is housed inside the bonnet 2. The side beam 27 is arranged perpendicular to the air cut plate 26 and prevents the heat exchanger 12R of the engine 12 from vibrating. The side beam 27 has a role of supporting the heat shield plate 12H.

  In addition, a gas spring 28 is housed inside the bonnet 2. One end of the gas spring 28 is attached to the side beam 27. The other end of the gas spring 28 is attached to the middle member 62. The gas spring 28 applies a load in a direction in which the middle member 62 is pushed upward. Therefore, the bonnet 2 can be opened by lightly pushing it up.

  By the way, a moment M1 that attempts to rotate downward by its own weight acts on the upper cover 21 (see FIG. 30). On the other hand, a moment M2 that attempts to rotate upward by the gas spring 28 acts on the upper cover 21 (see FIG. 30). Therefore, the upper cover 21 is required to have rigidity that is not distorted by two opposing moments M1 and M2. Further, it is known that when the upper cover 21 has low rigidity, a high-quality operation feeling cannot be obtained. For example, when the hood 2 is closed, the hood 2 vibrates finely, or the sound quality when the hood 2 is closed is deteriorated.

  Next, structural features of the bonnet 2 will be described.

  As a first feature, the center beam 631 connects the middle member 62 and the end member 63 (see FIG. 20). In other words, the center beam 631 has one end attached to the middle member 62 and the other end attached to the end member 63.

  As described above, the bonnet 2 according to the present invention includes the center beam 631. The center beam 631 connects the middle member 62 and the end member 63. Thereby, since the rigidity of the upper cover 21 improves, the bonnet 2 is not distorted. Furthermore, a high-quality operational feeling of the bonnet 2 can be realized.

  As a second feature, the bonnet hinge 65 is attached to the end member 63 and the center beam 631 (see FIG. 21). That is, the bonnet hinge 65 has one end attached to the end member 63 and the other end attached to the center beam 631.

  As described above, the bonnet 2 according to the present invention includes the bonnet hinge 65. The bonnet hinge 65 is attached to the end member 63 and the center beam 631. Accordingly, in the bonnet 2, the stress due to the moments M1 and M2 is not concentrated in the vicinity of the end member 63 but is distributed in the vicinity of the middle member 62, so that the bonnet 2 is not distorted.

  As a third feature, the weather strip 68 is attached to the end member 63 and contacts the air cut plate 26 disposed in the vicinity of the end member 63 (see FIGS. 27 and 32). That is, the weather strip 68 closes the gap between the end member 63 and the air cut plate 26 while being attached to the end member 63. The air cut plate 26 has different positions in the front-rear direction on the right side and the left side of the bonnet hinge 65 (see FIG. 27). When the right side of the bonnet hinge 65 in the air cut plate 26 is an “air cut plate 26R”, the weather strip 68 closes the gap between the end member 63 and the air cut plate 26R.

  As described above, the bonnet 2 according to the present invention includes the weather strip 68. The weather strip 68 is attached to the end member 63 and contacts the air cut plate 26 (26R) disposed in the vicinity of the end member 63. Accordingly, the bonnet 2 has a clear mounting position of the weather strip 68, and the mounting work of the weather strip 68 becomes easy. Even if the operator looks inside the upper cover 21, the engine 12 and the like are not visible because they are shielded by the weather strip 68, and a high-quality appearance of the bonnet 2 can be realized (see FIG. 33).

  In addition, the tractor 1 having the bonnet 2 takes air from a desired position by considering the shape of the weather strip 68 (for example, by shortening the length of the weather strip 68 and intentionally providing a gap). Can pass through. As a result, the gap between the end member 63 and the air cut plate 26 (26R) becomes a ventilation path, so that the heat of the engine 12 is less likely to be trapped. In this case, water and dust do not enter the bonnet 2 as compared with the case where the upper cover 21 is provided with the ventilation path.

  As a fourth feature, the weather strip 69 is attached to the support plate 64 and contacts the air cut plate 26 disposed in the vicinity of the support plate 64 (see FIGS. 27 and 32). That is, the weather strip 69 closes the gap between the support plate 64 and the air cut plate 26 while being attached to the support plate 64. The air cut plate 26 has different positions in the front-rear direction on the right side and the left side of the bonnet hinge 65 (see FIG. 27). When the left side of the bonnet hinge 65 in the air cut plate 26 is “air cut plate 26L”, the weather strip 68 closes the gap between the end member 63 and the air cut plate 26L.

  As described above, the bonnet 2 according to the present invention includes the weather strip 69 and the support plate 64. The weather strip 69 is attached to the support plate 64 and contacts the air cut plate 26 (26L) disposed in the vicinity of the support plate 64. As a result, the bonnet 2 has a clear mounting position of the weather strip 69, and the mounting operation of the weather strip 69 becomes easy. Even if the operator looks inside the upper cover 21, the engine 12 and the like are not visible because the weatherstrip 69 shields them, and a high-quality appearance of the bonnet 2 can be realized (see FIG. 33).

  In addition, the tractor 1 including the bonnet 2 takes air from a desired position by considering the shape of the weather strip 69 (for example, by shortening the length of the weather strip 69 and intentionally providing a gap). Can pass through. Thereby, since the clearance gap between the support plate 64 and the air cut plate 26 (26L) becomes a ventilation path, the heat of the engine 12 is hardly trapped. In this case, water and dust do not enter the bonnet 2 as compared with the case where the upper cover 21 is provided with the ventilation path.

  Below, the structure which can reduce the cost of the bonnet 2 is demonstrated.

  FIG. 34 shows two lower covers 22A and 22B. FIG. 35 shows a process of attaching the lower cover 22A, and FIG. 36 shows a process of attaching the lower cover 22B. FIG. 37 shows a state where each bonnet 2 is completed.

  The lower cover 22 has a skirt portion 22S extending downward. The lower cover 22 includes a long skirt portion 22S and a short skirt portion 22S. Here, the one having a long skirt 22S is referred to as “lower cover 22A” (see FIG. 34A), and the one having a short skirt 22S is referred to as “lower cover 22B” (see FIG. 34B).

  The lower cover 22A has a long skirt portion 22S, and the lower side of the skirt portion 22S is the same height as the lower side of the under spacer 53. In other words, the lower cover 22 </ b> A is in contact with a virtual line Lv whose lower side extends from the lower side of the under spacer 53. Therefore, the under spacer 53 is indispensable for the bonnet 2 configured using the lower cover 22A. Therefore, in the process of attaching the lower cover 22A, the under spacer 53 is disposed below the front grill 23 (see FIG. 35).

  The lower cover 22B has a short skirt portion 22S, and the lower side of the skirt portion 22S is the same height as the lower side of the front grille 23. In other words, the lower cover 22B is in contact with an imaginary line Lv whose lower side extends from the lower side of the front grille 23. Accordingly, the bonnet 2 configured using the lower cover 22B does not require the under spacer 53. Therefore, in the process of attaching the lower cover 22B, the under spacer 53 is not disposed below the front grill 23 (see FIG. 36).

  As described above, the upper cover 21 and the front grille 23 can be shared by at least two models. More specifically, in addition to the upper cover 21 and the front grille 23, the light units (24, 25) can be used in at least two models (see FIG. 37). Furthermore, the center pillar 51 and the side frame 52 constituting the bonnet 2 can also be used as a matter of course.

  Next, features of the bonnet 2 will be described.

  As a first feature, the upper cover 21 and the front grille 23 can be used in at least two models by changing the length of the skirt portion 22S in the lower cover 22 (see FIGS. 34 to 37). Therefore, since the upper cover 21 and the front grille 23 are used in common by at least two models, the production volume can be increased and the cost can be reduced (referred to as mass production effect).

  Thus, the upper cover 21 and the front grille 23 can be used in combination with at least two models by changing the length of the skirt portion 22S in the lower cover 22. As a result, the bonnet 2 can be reduced in cost by the mass production effect of the upper cover 21 and the front grille 23.

  As a second feature, when the skirt portion 22S is long, an under spacer 53 is disposed below the front grille 23. The lower cover 22A is in contact with a virtual line Lv whose lower side extends from the lower side of the under spacer 53 (see FIG. 34). Accordingly, since the height dimension of the bonnet 2 is increased, the bonnet 2 is suitable for a model in which the large engine 12 is mounted.

  Thus, when the skirt portion 22S is long, the lower cover 22 (22A) is in contact with a virtual line Lv whose lower side extends from the lower side of the under spacer 53. As a result, the bonnet 2 can cope with a model in which the large engine 12 is mounted without impairing the appearance, and can also serve as the upper cover 21 and the front grille 23.

  As a third feature, when the skirt portion 22S is short, the under spacer 53 is not disposed below the front grille 23. The lower cover 22B is in contact with a virtual line Lv whose lower side extends from the lower side of the front grill 23 (see FIG. 34). Therefore, since the height dimension of the bonnet 2 becomes small, it is suitable for a model in which a small engine 12 is mounted.

  Thus, when the skirt portion 22S is short, the lower cover 22 (22B) is in contact with a virtual line Lv extending from the lower side of the front grille 23 at the lower side thereof. As a result, the bonnet 2 can cope with a model in which the small engine 12 is mounted without impairing the appearance, and can also serve as the upper cover 21 and the front grille 23.

  As a fourth feature, the under spacer 53 is provided with one or a plurality of through holes 53h (see FIGS. 35 and 37). Therefore, the under spacer 53 can pass air from the inside of the bonnet 2 to the outside or from the outside to the inside.

  Thus, the under spacer 53 is provided with one or a plurality of through holes 53h. As a result, in the bonnet 2, since the under spacer 53 serves as a ventilation path, the heat of the engine 12 is less likely to be trapped.

DESCRIPTION OF SYMBOLS 1 Tractor 11 Chassis frame 12 Engine 13 Transmission 14 Front axle 15 Rear axle 16 Cabin 2 Bonnet 21 Upper cover 21h Opening 22 Lower cover 22A Lower cover 22B Lower cover 22S Skirt part 23 Front grill 231 Grill frame 232 Metal mesh 24 High beam lamp unit (lamp unit)
25 Low beam lamp unit (lamp unit)
26 Air cut plate 27 Side beam 28 Gas spring 31 Center mark 31R Ridge line 32 Symbol mark 41 Design plate 41h Through hole 51 Center pillar 52 Side frame 53 Under spacer 53h Through hole 61 Chip member 62 Middle member 63 End member 631 Center beam 64 Support Plate 65 Bonnet hinge 66 Weather strip 67 Weather strip 68 Weather strip 69 Weather strip Tr Target route r 畝

Claims (5)

An upper cover,
A front grill disposed below the front portion of the upper cover;
In the hood of the tractor having a lower cover disposed below the side of the upper cover,
The hood of a tractor, wherein the upper cover and the front grill can be used in at least two models by changing the length of the skirt portion in the lower cover. Comprising an under spacer disposed below the front grille,
If the skirt is long,
The hood of the tractor according to claim 1, wherein the lower cover is in contact with a virtual line whose lower side extends from the lower side of the under spacer. If the skirt is short,
The hood of the tractor according to claim 1, wherein the lower cover is in contact with an imaginary line whose lower side extends from the lower side of the front grill.   The hood of a tractor according to claim 2, wherein the under spacer is provided with one or a plurality of through holes.   A tractor provided with the bonnet as described in any one of Claims 1-4.

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