JP6559050B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle including a bonnet having a plurality of sheet metal members to which adjacent edge portions are welded.

  The work vehicle as described above includes, for example, a bonnet having a ceiling member and a lateral wall member as a plurality of sheet metal members, and the ceiling member and the lateral wall member are directed toward the inside of the bonnet as their adjacent edge portions. There are some which have edge portions that extend and are spot welded in a state in which the edge portions are in surface contact so that a connected state between the ceiling member and the lateral wall member is obtained (for example, Patent Document 1). reference).

Japanese Patent Laying-Open No. 2005-35420 (paragraph numbers 0022 to 0023, FIGS. 2, 4, and 5)

  In the work vehicle as described above, the coating for the purpose of preventing rust on the ceiling member and the side wall member is performed after the connection between the ceiling member and the side wall member by spot welding. Since the edge portion of the horizontal wall member is in surface contact, it is difficult for paint to enter between the edge portion of the ceiling member and the edge portion of the horizontal wall member. Therefore, it is easy for unpainted paint to occur between the edge portion of the ceiling member and the edge portion of the horizontal wall member, and there is a concern that appearance quality may be deteriorated due to generation of rust caused by unpainted paint.

  That is, it is desired to prevent deterioration of the appearance quality due to the generation of rust caused by unpainted paint on the bonnet.

As means for solving the above problems, a work vehicle according to the present invention is:
A bonnet having a plurality of sheet metal members to which adjacent edge portions are welded,
The plurality of sheet metal members are extended toward the inside of the bonnet so that the adjacent edge portions have adjacent surfaces facing each other,
Adjacent end edges are welded at their extended ends in a state of having a predetermined gap between the adjacent surfaces facing each other over substantially the entire width of the bonnet in the inner and outer directions .

According to this means, in the connected state in which the adjacent edge portions of the plurality of sheet metal members are welded, a predetermined gap is secured over the entire length of the adjacent edge portions between the adjacent surfaces facing each other. It becomes a state.
Therefore, when coating is performed on the plurality of connected sheet metal members, the paint spreads over the entire surface of each sheet metal member, and enters the entire area of the gap secured between the adjacent adjacent surfaces without leakage.
As a result, no paint is left unpainted between the adjacent edge portions of the plurality of sheet metal members, and deterioration in appearance quality due to the occurrence of rust due to paint unpainted can be prevented.

In addition, welding for connecting a plurality of sheet metal members can be performed from the lower side in the extending direction with respect to the extending end of the edge extending toward the inside of the bonnet. Compared with the case where it is carried out so as to sandwich the opposite portion of the edge portion from the adjacent direction, welding of the adjacent edge portion is facilitated.
As a result, work efficiency in welding work for connecting a plurality of sheet metal members can be increased.

As one of the means for making the present invention more suitable,
The bonnet is flush with a painted surface obtained by painting on the surface of the sheet metal member and a painted surface obtained by painting on the gap.

According to this means, when coating is performed on a plurality of connected sheet metal members, the paint spreads over the entire surface of each sheet metal member, and there is no leakage throughout the entire gap secured between the adjacent adjacent surfaces. In addition to entering, the painted surface in the surface region of each sheet metal member and the painted surface in the gap region formed by the paint that has entered and accumulated in the gap between adjacent surfaces are flush with each other.
As a result, the appearance of the bonnet can be brought into a good-looking state in which there is no step between the painted surface in the surface area of each sheet metal member and the painted surface in the gap area between the sheet metal members.

It is a left view of a tractor. It is a top view of a tractor. It is a left view of the principal part which shows the state which the bonnet is located in a closed position and the 2nd guard member of a front guard is located in a guard position. It is a left view of the principal part which shows the state which the bonnet is located in an open position, and the 2nd guard member of a front guard is located in a retracted position. It is a perspective view of the principal part which shows structures, such as a bonnet. It is a left view of a bonnet. FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6 showing the shapes of the upper edge portions of adjacent left and right side covers and the left and right lower edge portions of the upper cover. It is a vertical rear view of the principal part which shows the welding state of the upper edge part of an adjacent side cover, and the lower edge part of an upper cover. It is a vertical rear view of the principal part which shows the welding state of the upper edge part of the adjacent side cover and the lower edge part of an upper cover in a comparative example.

  Hereinafter, as an example of an embodiment for carrying out the present invention, an embodiment in which the present invention is applied to a tractor that is an example of a work vehicle will be described with reference to the drawings.

The direction indicated by the arrow F shown in FIG. 1 is the front side of the tractor, and the direction indicated by the arrow U is the upper side of the tractor.
2 is the front side of the tractor, and the direction indicated by the arrow L is the left side of the tractor.

  As shown in FIGS. 1 and 2, the tractor exemplified in the present embodiment includes a vehicle body frame 1 that forms a framework of the vehicle body, a driving unit 2 disposed on the front side of the vehicle body frame 1, and a rear portion of the vehicle body frame 1. The connected transmission unit 3, the riding-type driving unit 4 located at the upper rear side of the vehicle body frame 1, the left and right front wheels 5 that can be steered and driven by the power from the driving unit 2, and the power from the driving unit 2 The left and right rear wheels 6 to be driven, the swingable bonnet 7 that covers the driving part 2, the front guard 8 made of a steel plate that is positioned immediately before the bonnet 7 and protects the bonnet 7, and the rear end of the body frame 1 A protective frame 9 that is connected, and a mower 10 that is disposed in the lower abdomen between the left and right front wheels 5 and the left and right rear wheels 6 are provided.

  As shown in FIGS. 3 to 5, the vehicle body frame 1 includes left and right side members 11 made of a long steel plate, a center pillar 13 connected to the front and rear center sides of the left and right side members 11, and the left and right side members 11. Left and right brackets 14 for connecting the bonnet connected to the front end of the bonnet.

  As shown in FIGS. 1, 3, and 4, the driving unit 2 includes a water-cooled engine 15 that is supported by vibration isolation at the front portion of the vehicle body frame 1, a muffler 16 that is positioned in a lateral orientation immediately before the engine 15, A cooling fan 17 positioned immediately after the engine 15, a radiator 18 positioned immediately after the cooling fan 17, an air cleaner 19 positioned above the engine 15, and the like are provided.

  As shown in FIGS. 1 to 4, the driving unit 2 has an upper side of the rear end portion covered with the upper panel 20 and a lower side of the rear end portion covered with the under panel 21. The under panel 21 includes an intake opening 21A and a dustproof screen 21B that covers the opening 21A.

  The driving unit 4 includes a steering wheel 22 for steering the front wheels, a display panel 23 for displaying the engine speed, a driving seat 24 positioned above the transmission unit 3, and the like.

As shown in FIGS. 1 to 6, the bonnet 7 includes a front cover 25 that covers the front end portion of the driving portion 2, left and right side covers 26 that are left and right sheet metal members A that cover the lateral sides of the driving portion 2, and the driving force. The upper cover 27, which is a sheet metal member A that covers the upper part of the portion 2, is integrally connected, and the first swing shaft 28 located at the front end of the vehicle body frame 1 is used as a fulcrum to open and close. Move.
Thereby, the shape retention property of the bonnet 7 can be improved. Moreover, the bonnet 7 becomes a rear opening type which largely releases the rear side of the driving part 2 at the opening position. As a result, it becomes easy to perform maintenance on the radiator 18 and the like located on the rear side of the driving unit 2.

  As shown in FIGS. 5 and 6, the front cover 25 includes a U-shaped first member 25 </ b> A that forms a lower end portion of the front cover 25, and an upper side of the front cover 25 that functions as an exhaust part for discharging cooling air. The second member 25B that forms A dustproof screen is employed for the second member 25B. Each of the left and right side covers 26 has an opening 26A for discharging cooling air, and a dust-proof screen 26B covering the opening 26A is attached.

As shown in FIGS. 1 to 7, the bonnet 7 includes a bonnet frame 29 made of a steel plate that forms a framework of the bonnet 7, a headlight 30 having left and right light portions 30 </ b> A and a frame portion 30 </ b> B, and the like. .
The bonnet frame 29 has an upper cover 27 welded to an upper portion 29A thereof. The left and right side covers 26 and the upper cover 27 are welded to the upper edge portion 26C of the left and right side covers 26 and the lower left and right edge portions 27A of the upper cover 27, which are adjacent edge portions A1 thereof.
The bonnet frame 29 includes left and right first connecting portions 29B at the lower end portion of the front end portion thereof. The left and right first connecting portions 29B are connected to the left and right brackets 14 of the vehicle body frame 1 via left and right bolts 28 that function as left and right first support shafts 28, and the like.
The bonnet frame 29 includes a second connecting portion 29C at the left and right central portion of the front end portion thereof. The front cover 25 is connected to the lower side of the second connecting portion 29C, and the headlight 30 is connected to the upper end of the second connecting portion 29C. The front cover 25 has both left and right ends connected to the front ends of the left and right side covers 26. The left and right ends of the headlight 30 are connected to the left and right front ends of the upper cover 27.
As a result, the bonnet 7 includes a front cover 25, left and right side covers 26, an upper cover 27, a bonnet frame 29, and a headlight 30, and the left and right sides of the bonnet 7 positioned at the lower end portion of the front end of the bonnet 7 in a left-right orientation The first support shaft 28 is used as a fulcrum so that it can be opened and closed.

  As shown in FIGS. 1 to 4, the bonnet 7 is fixedly held in the closed position by the lock mechanism 33. Although not shown in the drawings, the lock mechanism 33 includes a front and rear rod provided on the bonnet 7, a hook member provided on the center pillar 13 so as to be able to swing left and right, and a center pillar side that urges the hook member to return to the lock position. Tension spring, etc. In conjunction with the swinging operation of the bonnet 7 to the closed position, the lock mechanism 33 temporarily retracts and swings toward the unlocking position against the action of the tension spring due to contact with the rod. Thereafter, as the bonnet 7 reaches the closed position, the bonnet 7 is fixedly held at the closed position by returning to the locked position by the action of the tension spring and being hooked on the rod.

The lock mechanism 33 includes an operation tool 40 that enables the hook member to swing to the unlocked position against the action of the tension spring. The operation tool 40 protrudes upward from an opening (not shown) at the left end of the upper panel 20.
Thus, when the unlocking operation tool 40 is positioned at the left end portion of the upper panel 20, the operator can operate the operation tool 40 from the operation unit 4 at the center of the left and right of the upper panel 20. This can be done quickly without being obstructed by the steering wheel 22.

As shown in FIGS. 1 and 3 to 5, the tractor includes an assist unit 50 that assists the opening operation of the hood 7. The assist unit 50 includes a gas spring 51 that is extended and biased by an internal compressed gas, and assists an opening operation of the bonnet 7 by an extension operation of the gas spring 51.
Thereby, the heavy bonnet 7 in which the front cover 25, the left and right side covers 26, the upper cover 27, and the like are integrally opened and closed can be easily opened and closed.

As shown in FIGS. 1 to 5, the front guard 8 includes a left and right first guard member 61 whose lower end 61 </ b> A is fixedly connected to the vehicle body frame 1, and a second guard member 61 positioned between the left and right first guard members 61. A guard member 62 is provided. The left and right first guard members 61 have a wider left-right distance than the left and right widths of the bonnet 7 and allow the bonnet 7 to enter between the left and right first guard members 61. The second guard member 62 extends in the left-right direction located at the front end of the vehicle body frame 1 over a guard position located immediately before the hood 7 in the closed position and a retracted position that allows the hood 7 to swing to the open position. It swings back and forth with the second support shaft 63 as a fulcrum. The left and right first guard members 61 are located on the vehicle front side of the front end portion 62A of the second guard member 62 whose front end portion 61B is located at the guard position.
As a result, when the operator performs maintenance on the prime mover 2 covered with the bonnet 7, the second guard member 62 is first swung from the guard position to the retracted position, and then the bonnet 7 is opened. By performing the above, the bonnet 7 can be largely swung in the opening direction without being restricted by the front guard 8. Thereby, the circumference | surroundings of the drive part 2 covered with the bonnet 7 can be largely released, and the maintenance with respect to the drive part 2 becomes easy.
When the worker runs the tractor, the bonnet 7 is closed and the second guard member 62 is positioned at the guard position. Therefore, when the front guard 8 collides with another object, it is usually fixed to the body frame 1. The connected front end portions 61B of the left and right first guard members 61 having high support strength collide with other objects. Accordingly, it is possible to effectively prevent the occurrence of inconvenience that the front guard 8 that collides with another object contacts the bonnet 7.
Further, when the front guard 8 collides with another object, the other object may enter between the left and right first guard members 61. In such a case, the second guard member 62 collides with the other object. Then, the bonnet 7 is protected.
As a result, the hood 7 can be reliably protected by the front guard 8 without impairing the maintainability of the prime mover 2 covered with the bonnet 7.

The front guard 8 includes a connecting member 64 that has a left-right width across the lower ends of the left and right first guard members 61 and connects the lower ends of the left and right first guard members 61. The connecting member 64 is joined to the front surface of the front end member 12 that forms the front end surface of the vehicle body frame 1.
Thereby, the intensity | strength and shape retention property of 61 A of lower ends in the 1st guard member 61 on either side can be improved. Further, the collision load when the front guard 8 collides with another object can be distributed to the front end surface of the vehicle body frame 1, and to the connection portion between the lower end portion 61 </ b> A of the left and right first guard members 61 and the vehicle body frame 1. Stress concentration can be prevented.
As a result, the hood 7 can be more reliably protected by the left and right first guard members 61 while improving the durability of the front guard 8.

As shown in FIG. 3, the front guard 8 includes a connecting mechanism 65 that connects the second guard member 62 at the guard position to the first guard member 61 on the right side.
Thereby, the support strength in the guard position of the 2nd guard member 62 can be raised. As a result, when the front guard 8 collides with another object and the other object enters between the left and right first guard members 61, the second guard member 62 with increased support strength collides with the other object. To do.
As a result, it is possible to effectively prevent the second guard member 62 from coming back and swinging or deforming due to a collision with another object and coming into contact with the bonnet 7, thereby protecting the bonnet 7 by the second guard member 62. Can be performed more reliably.

The connecting mechanism 65 is a left-right connecting pin 66 supported so as to be capable of moving in and out in the left-right direction at the right side portion of the free end portion of the second guard member 62, and a compression for projecting and biasing the connecting pin 66 to the left. A spring 67 is provided. The first guard member 61 on the right side is formed with a through hole (not shown) that allows the connecting pin 66 to be inserted therethrough.
When the second guard member 62 is positioned at the guard position, the connecting mechanism 65 has the right end portion of the connecting pin 66 projecting to the right outward of the second guard member 62 by the action of the compression spring 67, and the first guard member The second guard member 62 at the guard position is connected to the first guard member 61 on the right side by being inserted through the through hole 61.
When the second guard member 62 is positioned at the guard position, the coupling mechanism 65 is operated so that the coupling pin 66 is retracted to the left against the action of the compression spring 67, and the right end portion of the coupling pin 66 is the first guard. By being extracted from the through hole of the member 61, the connection between the second guard member 62 at the guard position and the first guard member 61 on the right side is released.
That is, the connection mechanism 65 can be easily changed into a connection state in which the second guard member 62 at the guard position is connected to the first guard member 61 on the right side and a release state in which the connection is released by the operation of the connection pin 66 to be withdrawn and retracted. Can be switched.

As shown in FIGS. 7 and 8, in the bonnet 7, the left and right side covers 26 and the upper cover 27 have an upper edge portion 26 </ b> C of the adjacent left and right side covers 26 and left and right lower edge portions 27 </ b> A of the upper cover 27. Further, the adjacent surfaces A1a and A1b facing each other are extended toward the inside of the bonnet 7 so as to have the upper surface 26Ca or the lower surface 27Aa. And the upper edge part 26C of the adjacent left and right side covers 26 and the left and right lower edge parts 27A of the upper cover 27 are arranged so as to have a predetermined gap 31 between the upper surface 26Ca and the lower surface 27Aa facing each other. The inner ends 26Cb and 27Ab serving as the extending ends A1b are welded.
Thus, the left and right side covers 26 and the upper cover 27 are connected to each other between the upper surface 26Ca and the lower surface 27Aa facing each other in a connected state where the adjacent upper edge portion 26C and lower edge portion 27A are welded. The gap 31 is secured over the entire length of the adjacent upper edge portion 26C and lower edge portion 27A.
Therefore, when the left and right side covers 26 and the upper cover 27 connected to each other are painted, the paint spreads over the entire surface of each side cover 26 and the upper cover 27, and between the opposing upper surface 26Ca and lower surface 27Aa. The entire space of the gap 31 secured in the gap enters without leakage.
As a result, there is no paint left between the upper edge portion 26C of the adjacent left and right side covers 26 and the left and right lower edge portions 27A of the upper cover 27, and the appearance quality due to the occurrence of rust caused by the paint left behind. Can be prevented.

Incidentally, when the left and right side covers 26 and the upper cover 27 are connected in the bonnet 7, for example, as shown in FIG. 9, the upper edge portions 26 </ b> C of the adjacent left and right side covers 26 and the left and right sides of the upper cover 27 are connected. The upper edge 26C and the lower edge 27A are arranged in a state where the lower edge 27A of the upper edge 26C is flush with the edge 26Cc of the upper edge 26C and the edge 27Ac of the lower edge 27A. It is conceivable to weld from the inside of the bonnet 7.
In this case, since the connection part of the side cover 26 and the upper cover 27 which become the welding target part becomes flat, there is a possibility that it is difficult to visually recognize the welding target part during the welding operation. Therefore, there is room for improvement in improving the welding work efficiency.

On the other hand, in the bonnet 7 illustrated in this embodiment, as shown in FIGS. 7 and 8, the upper edges of the adjacent left and right side covers 26 are connected to connect the left and right side covers 26 and the upper cover 27. The portion 26C and the lower left and right edge portions 27A of the upper cover 27 extend inward of the bonnet 7, and the inner end 26Cb of the upper edge portion 26C and the inner end 27Ab of the lower edge portion 27A are welded. Therefore, it is easy to visually recognize the welding target portion during the welding operation.
Further, welding for connecting the left and right side covers 26 and the upper cover 27 is performed by connecting the inner end 26Cb of the upper edge portion 26C and the inner end 27Ab of the lower edge portion 27A that extend toward the inside of the bonnet 7. On the other hand, since it can be performed from the lower side in the extending direction, for example, it is adjacent as compared with the case where welding is performed so as to sandwich the facing portion between the adjacent upper edge portion 26C and the lower edge portion 27A from the adjacent direction. It becomes easy to weld the upper edge portion 26C and the lower edge portion 27A.
As a result, the work efficiency in the welding work for connecting the left and right side covers 26 and the upper cover 27 can be increased.

As shown in FIG. 8, the bonnet 7 includes a painted surface 7A obtained by painting on the respective surfaces of the left and right side covers 26 and the upper cover 27, an upper edge portion 26C of the adjacent left and right side covers 26, and an upper cover 27. The painted surface 7B obtained by painting each gap 31 with the left and right lower edge portions 27A is flush with the other.
Accordingly, when the connected left and right side covers 26 and the upper cover 27 are painted, the paint spreads over the entire surface of each side cover 26 and the upper cover 27, and the upper surface 26Ca and the lower surface 27Aa facing each other. In addition to entering the entire gap 31 secured between the left and right side covers 26 and the upper cover 27 in the surface area of the left and right side covers 26 and the upper cover 27, the gap 31 between the opposing upper surface 26Ca and lower surface 27Aa. The coating surface 7B in the gap region formed by the paint that has entered and accumulated is flush with the coating surface 7B.
As a result, the external appearance of the bonnet 7 is changed to the painted surface 7A in the surface area of the left and right side covers 26 and the upper cover 27, and the painted surface 7B in the gap area between the adjacent left and right side covers 26 and the upper cover 27. It is possible to achieve a good-looking state in which no step is generated between the two.

[Another embodiment]
The present invention is not limited to the configuration exemplified in the above embodiment, and a typical alternative embodiment of the present invention will be exemplified below.

[1] The work vehicle may be configured to include the prime mover 2 and the bonnet 7 at the rear part of the body frame 1.

[2] The work vehicle may not be provided with the front guard 8.

[3] The bonnet 7 includes a front cover 25 and an upper cover 27 as the sheet metal member A, and the rear end portion of the front cover 25 serving as the adjacent edge portion A1 and the front end portion of the upper cover 27 are mutually connected. Arranged so as to extend toward the inside of the bonnet 7 so as to have the adjacent adjacent surface A1a and to have a predetermined gap 31 between the adjacent surface A1a at the rear end and the adjacent surface A1a at the front end. In this state, the extended end A1b at the rear end and the extended end A1b at the front end may be welded.

[4] The bonnet 7 includes a front cover 25, left and right side covers 26, and an upper cover 27 as the sheet metal member A, and the bonnet 7 has an adjacent edge A1a facing each other. The extension end A1b of the adjacent edge portion A1 is welded in a state of being extended inwardly and disposed so as to have a predetermined gap 31 between the adjacent adjacent surfaces A1a. It may be.

[5] The bonnet 7 includes left and right upper side covers and left and right lower side covers as the sheet metal member A, and the lower end portions of the left and right upper side covers and the left and right lower side covers serving as the adjacent edge portions A1 thereof. Are extended toward the inside of the bonnet 7 so as to have adjacent surfaces A1a facing each other, and a predetermined gap is provided between the adjacent surface A1a at the lower end and the adjacent surface A1a at the upper end. In a state of being arranged so as to have 31, the extension end A <b> 1 b at the lower end and the extension end A <b> 1 b at the upper end may be welded.

[6] The bonnet 7 includes left and right upper side covers and an upper cover 27 as the sheet metal member A, and the upper end portion of the upper side cover and the lower end portion of the upper cover 27 serving as the adjacent edge portions A1 thereof, Extending inward of the bonnet 7 so as to have adjacent surfaces A1a facing each other, and arranged so as to have a predetermined gap 31 between the adjacent surface A1a at the upper end and the adjacent surface A1a at the lower end In this state, the extended end A1b at the upper end and the extended end A1b at the lower end may be welded.

[7] The bonnet 7 includes a rear cover and an upper cover 27 as the sheet metal member A, and an adjacent surface in which a front end portion of the rear cover serving as an adjacent end edge portion A1 and a rear end portion of the upper cover 27 face each other. In a state where it extends toward the inside of the bonnet 7 so as to have A1a, and is arranged so as to have a predetermined gap 31 between the adjacent surface A1a at the front end and the adjacent surface A1a at the rear end. The extension end A1b at the front end and the extension end A1b at the rear end may be welded.

[8] The bonnet 7 is painted such that a step is generated between the painted surface 7A obtained by painting on the surface of the sheet metal member A and the painted surface 7B obtained by painting on the gap 31 between the sheet metal members. May be.

[9] The bonnet 7 may be of a front opening type that largely releases the front side of the prime mover 2 at the opening position.

  The present invention can be applied to a work vehicle such as a tractor, a mid-mount mower, a front mower, and a front loader provided with a bonnet having a plurality of sheet metal members to which adjacent edge portions are welded. .

7 Bonnet 7A Painted surface (surface area)
7B Painted surface (gap area)
31 Crevice A Sheet metal member A1 Edge edge A1a Adjacent surface A1b Extension end

Claims (2)

A bonnet having a plurality of sheet metal members to which adjacent edge portions are welded,
The plurality of sheet metal members are extended toward the inside of the bonnet so that the adjacent edge portions have adjacent surfaces facing each other,
The adjacent edge portions are arranged so as to have a predetermined gap between the adjacent surfaces facing each other over substantially the entire width of the bonnet in the inner and outer direction , and their extending ends are welded. car.   The work vehicle according to claim 1, wherein the bonnet has a painted surface obtained by painting the surface of the sheet metal member and a painted surface obtained by painting the gap.

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