WO2016189942A1

WO2016189942A1 - Work vehicle

Info

Publication number: WO2016189942A1
Application number: PCT/JP2016/059065
Authority: WO
Inventors: 松井浩; 黒田智之
Original assignee: ヤンマー株式会社
Priority date: 2015-05-27
Filing date: 2016-03-22
Publication date: 2016-12-01

Abstract

The present invention provides a work vehicle with which it is possible to simultaneously make the bonnet more compact and improve the appearance of the work vehicle. This work vehicle (A1, A2) comprises a prime mover unit (11) having an engine (40) or the like, and a driving unit (20) placed to the rear of the prime mover unit (11), wherein a waste heat cover (30, 100) having a waste heat hole (34, 130) is situated in a gap (88) formed between the driving unit (20) and a bonnet (80) covering the prime mover unit (11). Therefore, heat production from the prime mover unit (11) can be steadily discharged into the atmosphere through the waste heat hole (34, 130) of the waste heat cover (30, 100). Even if rainwater or water for washing the vehicle flows in through the waste heat hole (34, 130), the rainwater or the like can be made to flow out (can be discharged out) of the vehicle behind the prime mover unit (11) because the waste heat cover (30, 100) is placed behind the bonnet (80) covering the prime mover unit (11).

Description

Work vehicle

The present invention relates to a work vehicle including a motor unit having an engine and the like, and a driving unit disposed behind the motor unit.

Conventionally, there is one disclosed in Patent Document 1 as one form of work vehicle. That is, Patent Document 1 discloses a work vehicle in which an air circulation device is provided in a bonnet, and the air circulation device is provided in an upper panel of the bonnet and has an air opening surface that opens toward the front of the vehicle body. An air scoop part that forms a circulation port, a perforated plate that covers the air circulation port from the inside, and an engine high-temperature device below the air circulation port in order to guide water droplets that have passed through the perforated plate to a water drop drop allowable region in the engine room And a guide plate provided above. And when the engine mounted in the engine room is stopped, the cooling fan linked to the engine is also stopped, but the hot air in the engine room is released outside the hood through the air circulation port, I try not to stay in the engine room. In addition, a gap is provided between the bonnet and the cabin that covers the operation unit disposed behind the bonnet so that vibrations transmitted to the bonnet are not transmitted to the operation unit.

JP 2013-112283 A

However, in the air circulation device provided in the above-described work vehicle, the guide plate is provided above the engine high-temperature equipment below the air circulation port, and the water droplets that have passed through the perforated plate are placed in a water drop dropping allowable region in the engine room. Since it is necessary to guide, the guide plate hinders the compactness of the hood that covers the engine room. In addition, a gap is provided between the bonnet and the cabin disposed behind the bonnet in order to prevent the propagation of vibration. This gap impairs the appearance of the work vehicle.

Therefore, an object of the present invention is to provide a work vehicle capable of simultaneously reducing the size of the hood and improving the aesthetics of the work vehicle.

The invention described in claim 1
A work vehicle including a motor unit having an engine and the like, and a driving unit disposed behind the motor unit,
An exhaust heat cover having an exhaust heat hole is interposed in a gap formed between a bonnet that covers the prime mover portion and the operating portion.

In the first aspect of the present invention, since the exhaust heat cover having the exhaust heat hole is interposed in the gap formed between the bonnet covering the prime mover part and the operating part, the exhaust heat hole of the exhaust heat cover is provided. The heat generated from the prime mover can be discharged into the atmosphere steadily. Even if rainwater or car wash water flows from the exhaust heat hole, the exhaust heat cover is placed behind the hood that covers the prime mover, so rainwater etc. flows out of the machine behind the prime mover ( Discharge). Therefore, even when a diesel particulate filter (DPF) that generates heat is disposed in the prime mover, the DPF can be easily disposed at a position where rainwater or the like does not drip through the exhaust heat hole. It is possible to avoid the vapor from coming into contact with the DPF as vapor. The exhaust heat cover can cover the gap formed between the bonnet and the operating unit. That is, the bonnet can be made compact and the work vehicle can be improved at the same time.

Invention of Claim 2 is invention of Claim 1, Comprising:
The bonnet is pivotally supported at the rear part of the prime mover part via the opening and closing arm, and can be opened and closed in the vertical direction around the pivot part.
The exhaust heat cover covers the pivot part from above and is arranged with the front edge of the exhaust heat cover close to the pivot part,
The rear end edge of the closed bonnet and the front end edge of the exhaust heat cover are arranged by being superposed in the vertical direction, and a sealing material for maintaining sealing performance is interposed between them. To do.

In the invention of claim 2, the front end edge of the heat exhaust cover arranged close to the pivot part and the rear end edge of the closed bonnet are arranged in the vertical direction, and between them, Since a sealing material is provided to maintain the sealing performance, the sealing performance of the connecting portion between the front edge of the exhaust heat cover and the rear edge of the bonnet is ensured through the sealing material. It is possible to prevent rainwater and the like from entering from the connecting portion. At this time, the exhaust heat cover covers the pivot portion that pivotally supports the bonnet via the open / close arm from above, and the front end edge of the exhaust heat cover is disposed close to the pivot portion, so the exhaust heat cover The connection portion between the front end edge portion of the hood and the rear end edge portion of the bonnet can be disposed close to the pivotal support portion, and the connection position can be prevented from varying. As a result, the connecting portion can be sealed with high accuracy. That is, it is possible to ensure good sealing performance.

Invention of Claim 3 is invention of Claim 1 or 2, Comprising:
The exhaust heat hole is an elongated hole extending in the front-rear direction, and the front end is disposed closer to the inner side, the rear end is disposed closer to the outer side, and a heat exhaust guide piece projects from the rear end edge,
The exhaust heat flowing out from the prime mover through the exhaust heat hole is guided to the outside through the exhaust heat guide piece.

In the third aspect of the invention, the exhaust heat that flows out from the prime mover through the exhaust heat hole is guided toward the outside through the exhaust heat guide piece. It does not directly hit the operator who operates in the driving part. Therefore, even when the operating part is not covered with the cabin, the comfortability of the operator can be ensured satisfactorily.

Invention of Claim 4 is invention of Claim 1 or 2, Comprising:
The exhaust heat cover has a cover front part that covers the pivot part from above, and a cover rear part that covers the pivot part from behind,
The rear portion of the cover is formed in a concave line extending in the left-right direction, and exhaust heat holes formed as elongated holes extending in the left-right direction are formed in the rear portion of the cover.

In the invention according to claim 4, since the rear portion of the exhaust heat cover is formed in a concave line extending in the left-right direction, the rear portion of the cover is attached to the cabin even when the operation portion is covered with the cabin. Interference with the base portion of the front wiper, the ejection portion of the windshield washer, and the like can be avoided. And since the exhaust heat hole made into the elongate hole extended in the left-right direction is formed in the rear part of a cover, the exhaust heat exhausted through an exhaust heat hole hits the windshield of a cabin, and functions as a defroster. As a result, exhaust heat can be used effectively.

The invention according to claim 5 is the invention according to any one of claims 1 to 4,
The exhaust heat cover is characterized in that it is formed of a material having thermal conductivity capable of radiating to the atmosphere and rigidity that is difficult to be damaged by falling objects such as stones.

In the invention according to claim 5, since the exhaust heat cover is formed of a material having heat conductivity capable of radiating to the atmosphere and rigidity which is not easily damaged by falling objects such as stones, the heat transfer of the exhaust heat cover Therefore, the heat generated by the prime mover unit can be radiated to the atmosphere steadily, and the rigidity of the exhaust heat cover can prevent damage caused by falling objects such as stones, thereby ensuring good aesthetics.

According to the present invention, it is possible to simultaneously reduce the size of the hood and improve the aesthetics of the work vehicle.

The side view of a cabin type tractor. The top view of the front half part of a cabin type tractor. The perspective explanatory drawing of a motor part. The perspective explanatory drawing of a bonnet support machine frame. The perspective explanatory drawing of a bonnet reinforcement frame. The perspective explanatory view from the front upper left side of the rear strength member. The perspective explanatory view from the lower right rear of the rear strength member. The cross-section left view of a bonnet pivot part. The perspective explanatory view of a heat exhaust cover. The top view of a waste heat cover. The front view of a heat exhaust cover. The rear view of a waste heat cover. FIG. 11 is a cross-sectional view taken along the line I-I in FIG. 10. The side view of a rops type tractor. The top view of a rops type tractor. Sectional side view of the bonnet pivot part as another Example. The perspective explanatory view of the exhaust heat cover as other examples. The top view of the exhaust heat cover as another Example. The front view of the exhaust heat cover as another Example. The rear view of the exhaust heat cover as another Example. The side view of the exhaust heat cover as another Example. The II-II sectional view taken on the line of FIG. The perspective explanatory view of a radiator screen. Explanatory drawing of a radiator screen.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. A1 shown in FIGS. 1 and 2 is a cabin-type tractor that is one form of a work vehicle, and the tractor A1 covers the operating unit 20 with a cabin C. A2 shown in FIGS. 14 and 15 is a rops type tractor that is one form of the work vehicle, and the tractor A2 has a rops R standing behind the driving unit 20. Below, the whole structure of cabin type tractor A1 is demonstrated, and the structure used as the characteristic of tractor A1 is demonstrated. After that, the overall configuration of the ropse type tractor A2 will be described, and subsequently, the configuration that is a feature of the tractor A2 will be described.

[Description of overall configuration of cabin type tractor]
As shown in FIGS. 1 and 2, the cabin-type tractor A1 is provided with a prime mover portion 11 at the front portion of the body frame 10 that is stretched in the front-rear direction to form a frame, and at the rear end portion of the body frame 10, a transmission case. 12 is provided. The prime mover unit 11 and the transmission case 12 are interlocked and connected via a power transmission shaft (not shown). A front axle case 13 having an axis line in the left-right direction is attached to the front portion of the body frame 10, and a front wheel 15 is attached to the left and right end portions of the front axle case 13 via a front wheel shaft 14. A rear axle case 16 is attached to each of the left and right sides of the transmission case 12, and a rear wheel 18 is linked and connected to each rear axle case 16 via a rear wheel shaft 17. The transmission case 12 and the front axle case 13 are linked together via a front wheel drive shaft (not shown) to enable four-wheel drive for driving the front and

rear wheels

15 and 18. Reference numeral 19 denotes a fuel tank.

The tractor A1 has a driving unit 20 disposed immediately after the prime mover unit 11 on the body frame 10, and the driving unit 20 is covered with a cabin C. Since the configuration of the operating unit 20 is the same as the configuration of the operating unit 20 of the tractor A2, it will be described in the description of the overall configuration of the tractor A2 to be described later for convenience of description.

(Description of the structure of the prime mover)
As shown in FIG. 3, the prime mover unit 11 is configured by arranging an engine 40 and the like at the front portion of the machine body frame 10. That is, the body frame 10 is formed of a front part of the body frame 10 that supports the prime mover part 11 and a rear part of the body frame 10 that supports the operating part 20. The front part of the body frame 10 has a pair of left and right belt-like front and rear front and rear extension pieces 10a extending in the front and rear direction, arranged in a face-to-face manner with a certain interval in the left and right direction, A laterally long horizontal piece 10b formed in a laterally long plate shape in the lateral direction is formed between the front ends so as to extend horizontally. The rear part of the body frame 10 has a pair of left and right belt-like rear front / rear direction extending pieces 10c (see FIG. 1) extending in the front / rear direction and arranged facing each other at a predetermined interval in the left / right direction. A horizontally extending piece 10d (see FIG. 4) formed in a U shape in a back view is formed between the front portions of 10c. The rear end portions of the pair of left and right front longitudinally extending pieces 10a are integrally formed by connecting the front end portions of the pair of left and right rear longitudinally extending pieces 10c in an overlapped state from the outside. Between the rear ends of 10c, the front part of the mission case 12 is connected in an interposed state.

The engine 40, which is the main component, is mounted with its lower portion fitted between the rear portions of the pair of left and right front longitudinally extending pieces 10a. A clutch housing 66 is integrally formed at the rear end portion of the engine 40. A cooling fan 42 is linked to a front side of the engine 40 via a fan shaft 41 having an axis line in the front-rear direction.

A support plate 43 is installed in a laid manner between the front portions of the pair of left and right front longitudinally extending pieces 10a, and the radiator 45 and the like are supported on the support plate 43. The front end edge portion 44 of the support plate 43 is formed in a mountain shape that matches a front end portion of the lower end edge of the bonnet 80 described later, and supports the bonnet 80 when closed.

In front of the cooling fan 42, a radiator 45 is erected on the rear portion of the support plate 43 so as to face the cooling fan 42. A radiator screen 46 for preventing dust and dust from adhering to the radiator 45 is disposed immediately before the radiator 45 so that the front surface of the radiator 45 is covered. An oil cooler 47 and a fuel cooler 48 are disposed immediately above and below the radiator screen 46. A condenser 49 for an air conditioner is disposed immediately before these

coolers

47 and 48. A sub tank 50 and a receiver dryer 51 are disposed on the left side and the right side just before the capacitor 49. On the rear part of the support plate 43, a gate-type support body 52 formed in a front view gate shape so as to surround the left and right sides and the upper side of the radiator 45 is erected, and pipes and the like are supported by the gate-type support body 52. ing.

A diesel particulate filter (hereinafter abbreviated as “DPF”) 53 formed in a cylindrical box shape with the axis line in the front-rear direction is disposed immediately above the left side of the engine 40. A rear end portion of the DPF 53 is connected to an exhaust port portion of the engine 40 through an exhaust pipe 54. The front end portion of the DPF 53 is connected to the base end portion of the tail pipe 55 so that the front end portion of the tail pipe 55 is opened downward on the left side. On the other hand, an air cleaner 56 communicatively connected to the intake port portion of the engine 40 via the proximal end side intake pipe 57 is disposed immediately above the right rear portion of the engine 40. The air cleaner 56 is connected in communication with a front end side intake pipe 58, and the front end portion is fixed to the upper right side of the gate-type support body 52 and opened forward. A compressor 59 for an air conditioner is disposed immediately above the right front portion of the engine 40, and the compressor 59 is linked to the fan shaft 41 via a linked belt mechanism A.

(Description of the structure of the hood support machine frame)
As shown in FIG. 4, the prime mover section 11 configured as described above is provided with a bonnet support machine frame 60 as a front strength member, and a hood 80 is attached to the bonnet support machine frame 60 so as to be freely opened and closed. 80 allows the motor unit 11 to be opened and closed.

The bonnet support machine frame 60 is formed of a front frame 61, a rear frame 62, and an intermediate frame 63. The front frame 61 is formed in a vertically long rectangular gate shape when viewed from the front, is erected on the support plate 43, and is disposed so as to surround the left and right sides and the upper side of the oil cooler 47 and the fuel cooler 48. . A bonnet lock mechanism 64 is provided on the upper portion of the front frame 61. A pair of left and right auxiliary frames 65 are erected on the support plate 43 immediately before the front frame 61, and the upper end portions of both auxiliary frames 65 are connected to the upper end portion of the front frame 61. . The rear frame 62 has a support base 67 mounted on a clutch housing 66 formed at the rear end of the engine 40, and a support main piece 68 is raised upward from the support base 67 to form an upright shape. Yes. The intermediate frame 63 is formed in a circular pipe shape that extends in the front-rear direction. The front end portion of the intermediate frame 63 is connected to the central upper portion of the front frame 61 via the connecting body 69, while the rear end portion of the intermediate frame 63 is connected to the upper end portion of the support main piece 68 via the support body 70. is doing. On the support body 70, the pivot part 71 which pivotally supports the bonnet 80 so that opening and closing is possible is provided. The connecting body 69 includes a front connecting piece 69a projecting rearward from the upper center of the front frame 61 over the upper end surface of the radiator 45, and a rear connecting piece attached to the front end of the intermediate frame 63 in a cross shape. 69b are connected to each other in a butted manner from the front-rear direction at the upper rear position of the radiator 45. The connecting body 69 supports the upper end portion of the radiator 45 erected on the support plate 43.

The pivot portion 71 includes a pivot piece 72 formed in a U-shape when viewed from the front, a pivot 73 that is horizontally placed between the upper ends of the pivot piece 72 with the axis lined in the left-right direction, and a pivot 73 that is rotatably fitted to the pivot 73. The boss portion 74 and an opening / closing arm 75 having a base edge portion attached to the boss portion 74 are formed. The open / close arm 75 is formed by forming the arm front portion 76 in a square plate ring shape and curving the arm rear portion 77 downward in a U shape in a side view. The rear end 77 of the arm is pivotally supported on the pivot 73 via the boss 74, and the front end is connected integrally with the rear end of the arm front 76. In addition, the rear end portion of the bonnet 80 is attached to the arm front portion 76 with a connecting bolt 78 via a front / rear extending frame 93. Accordingly, the bonnet 80 can be opened by turning the pivot 73 around the bonnet fulcrum and turning the front end upward. At this time, the arm rear portion 77 of the open / close arm 75 is bent downward so that the rear end edge of the bonnet 80 interferes with a heat exhaust cover 30 described later covering the portion directly above the pivot 73. This prevents the bonnet 80 from opening up.

A cover front mounting piece 72b protrudes outward from each of the upper ends of the pair of left and right rising pieces 72a forming a part of the pivot piece 72, and the cover front mounting piece 72b has a vertical direction. A cover front mounting hole 72c is formed in the cover. A cover rear mounting piece 72d protrudes from the left and right rear portions of the support 70, and a cover rear mounting hole 72e that opens in the vertical direction is formed in the cover rear mounting piece 72d. And the exhaust heat cover 30 mentioned later is attached via each

attachment piece

72b, 72d.

(Description of bonnet configuration)
As shown in FIGS. 1 and 2, the bonnet 80 includes a ceiling surface portion 81 formed in a shape that reverses the bottom of the boat (so-called a bottom ceiling), a mesh-shaped front portion (front grill) 82, It is formed in a box shape that opens downward and rearward from the right

side surface portions

83, 83, and most of the prime mover portion 11 can be opened and closed via a pivotal support portion 71. That is, the bonnet 80 is formed in a full open type. The portion that cannot be covered by the bonnet 80, that is, the left and right sides of the lower portion of the motor unit 11 that remains, is slightly covered by a pair of left and right side covers 84 formed in a flat fan shape. The side cover 84 is fixed to the hood support machine frame 60. 84 a is a vent hole formed in line with the side cover 84.

The ceiling surface portion 81 is formed of a flat ceiling surface 81a and left and right side surfaces 81b and 81b that are bulged outwardly from the left and right side edges and the front end edge of the ceiling surface 81a. A pair of left and right headlamps 85 are attached to the upper left and right sides of the front portion 82. A bonnet reinforcing frame 90 is provided on the inner surface of the ceiling surface portion 81.

(Description of bonnet reinforcement frame configuration)
As shown in FIG. 5, the bonnet reinforcing frame 90 is attached with a front department type frame 91 and a rear department type frame 92 which are formed by curving left and right along the inner surface at the front and rear parts of the inner surface of the bonnet 80. ing. A front / rear extending frame 93 formed by extending in the front / rear direction along the inner surface is attached to the central portion of the inner surface of the ceiling surface portion 81 so as to intersect the

portal frames

91 and 92. From the left and right side edges of the front section type frame 91, left and right side edges formed along the gate-type support body 52 and a front edge formed along the front edge edge 44 of the support plate 43. The curved reinforcing frame 94 is formed in a U shape when viewed from the front. A front end straight frame 95 is interposed between the center portion of the curved reinforcing frame 94 and the front end portion of the front and rear extension frame 93 in a erected manner. At the front end of the front / rear extending frame 93, a projecting frame 96 projects in a projecting manner on the left and right sides along the front inner surfaces of the left and right side surfaces 81b, 81b. These frames 91 to 96 reinforce the bonnet 80 from the inside.

A closed piece 97 is provided on the ceiling surface portion 81 in a closed state located directly above the bonnet lock mechanism 64 via a front / rear extending frame 93. Then, the locked piece 97 is locked to the bonnet lock mechanism 64, so that the bonnet 80 is held in a closed state, while the bonnet lock mechanism 64 is unlocked to release the hood 80. It is possible. The lock / release operation of the bonnet lock mechanism 64 can be operated below the right front portion of the support plate 43 via the wire 98. Reference numeral 99 denotes a pair of left and right pressing springs provided on the upper portion of the front frame 61, and the pressing springs 99 are pressed and biased upward to open the hood 80.

One gas damper 86 as a support means is interposed between the first connecting piece 93a provided in the middle part of the front and rear extension frame 93 of the bonnet reinforcing frame 90 and the rear part of the intermediate frame 63 of the bonnet support machine frame 60. Has been established. Between the second connecting piece 63a provided at the front portion of the intermediate frame 63 and the arm front portion 76 of the open / close arm 75, another gas damper 87 is interposed as support means. The one gas damper 86 is provided so as to support the hood 80 so that it can be easily opened, and the other gas damper 87 is provided so as to support the hood 80 so that it can be easily closed.

(Description of cabin configuration)
As shown in FIGS. 1, 2, 6, and 7, the cabin C includes a cabin frame 200 that is framed so as to form a hexahedron, and each surface portion that is interposed between each piece that forms the cabin frame 200. Formed from.

That is, as shown in FIGS. 6 and 7, the cabin frame 200 includes a pair of left and right front struts 202, a middle strut piece 204, and a rear strut piece 206 that extend in the vertical direction and are spaced apart in the front-rear direction. is doing. A pair of left and right upper girder pieces 208 extending in the front-rear direction are installed between the upper end portions of these

column pieces

202, 204, and 206, and between the lower end portions of these

column pieces

202, 204, and 206, A pair of left and right lower girders 210 extending in the direction are installed. The pair of left and right lower girder pieces 210 are formed so that the lower girder piece front part 212 is formed in a horizontal straight shape along the left and right end edges of the floor surface part 21, and the lower girder piece rear part 214 is formed of the pair of left and right fenders 29. A curved shape is formed along the upper surface. A front beam piece 216 extending in the left-right direction is horizontally placed between the upper ends of the pair of left and right front column pieces 202. On the other hand, a rear upper beam piece 218 is formed between the upper end portions of the pair of left and right rear column pieces 206 so as to extend in the left-right direction and bend in a protruding manner in the rearward direction. A lower rear beam piece 220 that extends in the left-right direction and is curved in a rearward projecting shape so as to have substantially the same shape as the rear upper beam piece 218 is horizontally mounted between the lower ends of the left and right rear column pieces 206. Formed. Between the rear ends of the pair of left and right upper girder pieces 208, a main body support body 222 that is drawn and bent in a rearward projecting manner along the rear upper beam piece 218 is installed. A horizontal projecting and strip-like horizontal projecting surface part 224 that curves along the upper beam piece 218 and a rising surface part 226 that rises upward from the rear edge of the horizontal projecting surface part 224 are integrally formed by a thin sheet metal having rigidity. is doing.

The cabin frame 200 formed in this way forms part of the rear strength member 230, and the rear strength member 230 forms a pair of left and right sides that form part of the cabin frame 200 as shown in FIGS. A horizontal plane floor plate 232 that forms the main body of the floor surface portion 21 is stretched between the front portions 212 of the lower girders. On the upper surface of the floor plate 232, a mat surface 233 (see FIG. 15) is stretched to form the floor portion 21. A shielding plate 22 that shields between the motor unit 11 and the operation unit 20 is provided upright at the center of the front edge of the floor plate 232. The shielding plate 22 is formed in a minimum necessary shape and size capable of covering the entire back surface of the prime mover unit 11 to prevent hot air generated in the prime mover unit 11 from flowing into the operating unit 20 side. . A pair of left and right reinforcing pieces 234 extending horizontally in the left-right direction is interposed between the upper left and right sides of the shielding plate 22 and the middle part of the pair of left and right front support columns 202. The rear end edge of the floor plate 232 is connected to the front end edge of the support frame face plate 236 formed in a stepped ridge, and the driver's seat 28 is mounted on the transmission case 12 via the support frame face plate 236. . A rear plate 238 is extended and stretched at the rear end edge of the support frame face plate 236 toward the rear lower beam piece 220 so as to be inclined at the front and rear heights. A pair of left and right fenders 29 are interposed between the left and right side edge portions of the support frame face plate 236 and the back plate 238 and the pair of left and right lower digit piece rear portions 214, respectively. A pair of left and right front lower horizontal pieces 240 extending in the left-right direction are horizontally mounted between the left and right lower ends of the shielding plate 22 and the lower ends of the front column pieces 202 at the left and right front portions of the floor plate 232. Yes. Between the inner end of the pair of left and right front lower horizontal pieces 240 and the middle part of the rear lower beam piece 220, it curves downward along the floor plate 232, the support frame face plate 236 and the back plate 238. A pair of left and right floor girders 242 are installed, and the pair of left and right floor girders 242 support the floor plate 232, the support frame face plate 236, and the back plate 238 from below. 244 is a pair of left and right front anti-vibration bodies attached to the inner lower surface of the pair of left and right front lower

horizontal pieces

240, and 246 is a rear vibration isolator provided in the middle of the pair of left and right floor girders 242 It is.

The rear strength member 230 configured in this way is mounted on the body frame 10 via the pair of left and right front vibration isolator 244 and the pair of left and right rear vibration isolator 246, so that the cabin C has a vibration isolation structure. It is done.

Cabin C is configured as shown in FIG. That is, the ceiling portion 250 formed in the shape of a flat box is stretched on the ceiling surface portion formed by the pair of left and right upper girder pieces 208, the front beam pieces 216, the rear upper beam pieces 218, and the main body support 222. Has been established. A front glass portion 252 is stretched on the front upper surface formed by the pair of left and right front column pieces 202, the front beam pieces 216, and the pair of left and right reinforcing pieces 234, and a pair of left and right front column columns A pair of left and right front wall portions 254 are stretched on the lower part of the front surface formed by the piece 202, the pair of left and right reinforcing pieces 234, and the pair of left and right front lower part horizontal pieces 240. A pair of left and right entrance / exit doors 256 are opened and closed freely on the left and right side surfaces formed by the pair of left and right front column pieces 202, the intermediate column columns 204, the upper beam pieces 208, and the lower beam pieces 210. Has been established. A pair of left and right side window portions 258 are stretched in a freely openable and closable manner on the left and right side surfaces formed by the pair of left and right middle column pieces 204, the rear column pieces 206, the upper beam pieces 208 and the lower beam pieces 210. is doing. A rear glass portion 260 is stretched over the rear surface portion formed by the pair of right and left rear column pieces 206, the rear upper beam piece 218, and the rear lower beam piece 220 so as to be opened and closed. 262 is a front wiper, 264 is a rear wiper, 266 is a low speed mark, and 268 is a boarding / alighting step.

The ceiling portion 250 is provided with an air conditioner main body disposing portion 270 projecting rearward from the pair of left and right rear column pieces 206, and the air conditioner main body disposing portion 270 constitutes a part of the air conditioner device 300. An air conditioner main body 310 is provided. The air conditioner main body 310 is supported from below by the rear ceiling piece 222. The air conditioner 300 includes an air conditioner main body 310, an air conditioner condenser 49, an air conditioner compressor 59, a receiver dryer 51, and the like. A base portion of the front wiper 262 is attached to a lower center portion of the front glass portion 252 through a wiper attachment hole 22 a provided at the upper end portion of the shielding plate 22.

The cabin C configured as described above has an anti-vibration structure configured integrally with the rear strength member 230, and the rear strength member 230 supports the bonnet as the front strength member via the fuselage frame 10. The strength member of the tractor A1 is configured by being integrally connected to the machine casing 60.

As shown in FIG. 8, a gap 88 is formed between the hood 80 that covers the prime mover section 11 configured as described above and the cabin C. In the gap 88, the exhaust heat having the heat exhaust holes 34 is formed. A cover 30 is interposed.

Next, a configuration that is a feature of the tractor A1, that is, a configuration of the exhaust heat cover 30 will be described.

[Explains the configuration of the exhaust heat cover]
As shown in FIGS. 8 to 13, the heat exhaust cover 30 includes a cover front portion 31 that covers the pivot 73 of the pivot portion 71 from above, and a cover rear portion 33 that covers the pivot 73 from behind. . The cover rear portion 33 is formed in a groove extending in the left-right direction, and a heat exhaust hole 34 is formed in the cover rear portion 33 as an elongated hole extending in the left-right direction.

More specifically, as shown in FIGS. 1 and 2, the bonnet 80 is cut into a horizontally long trapezoidal shape with the rear end portion of the ceiling surface 81 a facing forward to form the exhaust heat cover disposing recess 35. is doing. The exhaust heat cover 30 is disposed in a fitted state in the exhaust heat cover disposition recess 35. The heat exhaust holes 34 are formed horizontally long in the left-right direction, and are arranged in parallel in the front-rear direction on the left side of the cover rear portion 33, and in the front-rear direction on the right side of the cover rear portion 33. Three are arranged. A more concave central recess 36 is formed between the left and right heat exhaust holes 34, that is, in the center of the cover rear portion 33, and the base of the front wiper 262 and the ejection portion of the windshield washer (not shown). A space for avoiding interference with the above is secured. A front end edge 32 that is slightly narrower than the left and right widths of the cover front portion 31 is projected forward from the front lower portion of the cover front portion 31, and a sealing material 126 is attached to the front end edge 32. .

Further, the exhaust heat cover 30 is formed of a material (for example, an iron plate) having thermal conductivity capable of heat radiation to the atmosphere and rigidity that is not easily damaged by falling objects such as stones. Therefore, the heat conductivity of the exhaust heat cover 30 can steadily radiate the heat generated by the motor unit 11 to the atmosphere, and the rigidity of the exhaust heat cover 30 can prevent damage caused by falling objects such as stones. The appearance of the exhaust heat cover 30 can be ensured satisfactorily.

The sealing material 126 extends in the left-right direction and is formed to have substantially the same width as the left-right width of the front end edge portion 32. The seal material 126 is integrally formed of an elastic material from a cylindrical seal main piece 127 extending in the left-right direction and a seal mounting piece 128 having a U-shaped cross section extending in the left-right direction. The seal attachment piece 128 is attached to the front edge portion 32 by being externally fitted from the front. The main seal piece 127 is integrally formed on the upper surface of the seal mounting piece 128, while the rear edge 89 of the ceiling surface 81a of the bonnet 80 is formed in a folded shape at a right angle so that when the bonnet 80 is closed, The rear end edge portion 89 of the ceiling surface 81a formed in a folded shape at a right angle abuts on the peripheral surface of the rear half portion of the piece 127 so that the sealing performance is maintained well.

As shown in FIG. 2, the exhaust heat holes 34 are arranged behind the DPF 53 with a constant interval D. For this reason, even when rainwater or washing water flows through the exhaust heat hole 34, rainwater or the like does not contact the DPF 53 that generates heat.

37 is a cover front mounting hole provided on the left and right sides of the cover front portion 31, and each cover front mounting hole 37 is formed in alignment with each cover front mounting hole 72c described above, The cover front part 31 is fixed with screws. Reference numeral 38 denotes cover rear mounting holes provided on the left and right sides of the cover rear portion 33. The cover rear mounting holes 38 are formed in alignment with the cover rear mounting holes 72e described above to form the cover rear portion 33. It is fixed with screws.

In the heat exhaust cover 30 configured as described above, the cover rear portion 33 of the heat exhaust cover 30 is formed in a concave line extending in the left-right direction, so that even when the operation unit 20 is covered with the cabin C, the cover rear portion 33 can avoid interfering with the base part of the front wiper 262 attached to the cabin C, the ejection part of a windshield washer (not shown), and the like. And since the exhaust heat hole 34 which became the elongate hole extended in the left-right direction is formed in the cover rear part 33, the exhaust heat exhausted through the exhaust heat hole 130 is the windshield of the cabin C arrange | positioned closely It hits the part 252 and functions as a defroster. As a result, exhaust heat can be used effectively.

[Explanation of the overall structure of the Lobs type tractor]
14 and 15, the rops type tractor A2 has the same basic structure as the cabin type tractor A1, but the operating unit 20 is not covered with the cabin C, and the rops R and the windbreak plate. 23 and 23 are greatly different. And since the operation part 20 is not coat | covered with the cabin C, the shape of the heat exhaust cover 100 as another embodiment and the shape of the heat exhaust hole 130 are also different.

As with the tractor A1, the tractor A2 has a driving unit 20 disposed on the body frame 10 immediately after the prime mover unit 11. The operation unit 20 has a floor surface portion 21 stretched on the body frame 10 from a position immediately after the prime mover unit 11 to a position immediately before the mission case 12. A shield plate 22 that shields the motor unit 11 and the operating unit 20 is erected at the front edge of the floor surface 21, and

windproof plates

23 and 23 are erected adjacent to the left and right sides of the shield plate 22. ing. A steering mechanism (not shown) is attached to the shielding plate 22, and a steering case 24 that covers the steering mechanism is attached. A dashboard 25 is attached on the front part of the steering case 24. A handle 27 is linked to the steering mechanism via a handle support shaft 26. A driver's seat 28 is placed on the mission case 12 located behind the handle 27. A pair of left and

right fenders

29 and 29 are formed on the left and right sides of the driver's seat 28 so as to rise from the left and right side edges of the rear portion of the floor 21 and cover the upper front portions of the

rear wheels

18 and 18. ing. 30 is an operation pedal group, and 31 is an operation lever group. The Ropps R is formed in a rear view portal type, and stands upright on the left and right

rear axle cases

16 and 16, thereby protecting the operator sitting on the driver's seat 28 when the aircraft rolls over. Is.

A gap 88 is formed between the bonnet 80 covering the prime mover section 11 configured as described above and the operating section 20, and the exhaust heat cover 100 having the exhaust heat holes 130 is interposed in the gap 88. is doing.

Next, a configuration that is a feature of the tractor A2, that is, a configuration of the exhaust heat cover 100 as another embodiment will be described.

[Description of configuration of exhaust heat cover as another embodiment]
As shown in FIGS. 16 to 22, the heat exhaust cover 100 includes a front and rear wide portion 110 corresponding to the ceiling surface 81a of the ceiling surface portion 81, left and right side surfaces 81b and 81b, and left and right side surfaces 83 and 83 of the ceiling surface portion 81. The corresponding front and rear short width portions 115 are formed in a gate shape having the same shape as that of the rear end edge portion of the bonnet 80 in the rear view. The front / rear wide portion 110 is formed to have a front / rear width that is approximately 1/11 of the front / rear width of the bonnet 80, and the front / rear short width portion 115 is formed to have a front / rear width that is approximately a quarter of the front / rear wide portion 110. is doing. And the front end edge part 112 of the front-back wide part 110 and the front end edge part 122 of the front-back short width part 115 are formed in the stepped concave shape, and are integrally formed in the bending shape by the side view. On the other hand, the rear end edge portion 114 of the front and rear wide portion 110 and the rear end edge portion 124 of the upper half portion of the front and rear short width portion 115 are formed in a stepped concave shape and are integrally formed along the flush virtual vertical end surface. is doing. The rear end edge portion of the bonnet 80 is formed so as to be able to fit into the front end edge portion 112 of the front / rear wide portion 110 and the front end edge portion 122 of the front / rear short width portion 115 formed in a stepped concave shape in abutting manner. Further, the front end edge 25a at the upper part of the dashboard 25 is formed in a stepped ridge, and the rear end edge 114 of the front and rear wide part 110 and the upper half of the front and rear short part 115 formed in a stepped concave shape. It is formed so as to be able to fit with the rear end edge portion 124 in a butting manner. The surfaces of the bonnet 80, the exhaust heat cover 100, and the dashboard 25 are formed to be flush with each other. The exhaust heat cover 100 is formed of a material (for example, an iron plate) having thermal conductivity capable of heat radiation to the atmosphere and rigidity that is difficult to be damaged by falling objects such as stones.

The front and rear wide portion 110 covers the pivot 73 of the pivot portion 71 from above, and the front end edge 112 of the front and rear wide portion 110 is disposed close to the pivot 73 of the pivot portion 71 so that the ceiling surface of the closed bonnet 80 is closed. The rear end edge portion 81a and the front end edge portion 112 of the front and rear wide portion 110 are arranged on the inner and outer sides, and a sealing material 126 is provided between the overlap portions to maintain the sealing performance. ing. The sealing material 126 extends in the left-right direction and is formed to have substantially the same width as the left-right width of the front end edge portion 112 of the front-rear wide width portion 110. When the bonnet 80 is closed, the rear end edge portion 89 of the ceiling surface 81a formed in a folded shape at a right angle comes into contact with the peripheral surface of the rear half of the seal main piece 127, and the sealing performance is kept good. I am doing so.

A plurality (six in this embodiment) of exhaust heat holes 130 are provided in the front-rear wide portion 110 with a space in the left-right direction. The exhaust heat hole 130 is an elongated hole extending in the front-rear direction, the front end is disposed on the inner side, the rear end is disposed on the outer side, and a heat exhaust guide piece 140 is projected from the rear end edge. ing. The exhaust heat flowing out from the prime mover unit 11 through the exhaust heat hole 130 is guided toward the outside through the exhaust heat guide piece 140.

More specifically, the exhaust heat holes 130 are arranged in parallel on the left half of the front / rear wide portion 110 in parallel with each other in an inclined manner, while the three heat exhaust holes 130 are inclined on the right half of the front / rear wide portion 110. Are arranged in parallel with each other, and three are arranged in a “C” shape symmetrically on the left and right lines. At the rear edge of each heat exhaust hole 130, a heat exhaust guide piece 140 is formed so as to protrude upward in a raised shape. The heat exhaust guide piece 140 has an opening surface 141 of approximately 45 degrees from the front. It is formed so as to be directed in a direction biased outward at an angle. The exhaust heat in the bonnet 80 is released to the outside through the three exhaust heat holes 130 in the left half, and is released from the opening surface 141 toward the front left side through the exhaust heat guide piece 140. On the other hand, it is discharged outside the machine through the three heat exhaust holes 130 in the right half, and is discharged from the opening surface 141 toward the front right side through the heat exhaust guide piece 140. In this manner, the exhaust heat released from each exhaust heat hole 130 is released by the exhaust heat guide piece 140 so as to expand in the left and right direction toward the direction opposite to the traveling direction of the airframe, and the rear of each exhaust heat hole 130. The operator who sits in the driver's seat 28 and operates is prevented from hitting. The relative arrangement positional relationship between the exhaust heat hole 130 and the DPF 53 is such that the DPF 53 is not disposed immediately below the exhaust heat hole 130. In the present embodiment, the DPF 53 is disposed in front of the exhaust heat hole 130 so that rainwater or the like does not contact the DPF 53 that generates heat even when rainwater or washing water flows through the exhaust heat hole 130. Reference numeral 142 denotes an exhaust heat cover locking piece, and reference numeral 143 denotes an exhaust heat cover mounting screw hole. The exhaust heat cover locking piece 142 can be locked to a locking protrusion (not shown) provided on the shielding plate 22. The exhaust heat cover mounting screw hole 143 is formed in alignment with the cover front mounting hole 72c described above, and the exhaust heat cover 100 is screwed and attached through these

holes

143 and 72c. .

In the tractor A2 configured as described above, the exhaust heat cover 100 having the exhaust heat holes 130 is interposed in the gap 88 formed between the bonnet 80 covering the prime mover unit 11 and the operation unit 20. The heat generated from the motor unit 11 can be exhausted to the atmosphere through the exhaust heat hole 130 of the exhaust heat cover 100. Even if rainwater or car wash water flows from the exhaust heat hole 130, the exhaust heat cover 100 is disposed behind the hood 80 that covers the prime mover unit 11. It can flow out (discharge) out of the machine. For this reason, even when the DPF 53 that generates heat is disposed in the prime mover unit 11, the DPF 53 can be easily disposed at a position where rainwater or the like does not drip through the exhaust heat hole 130, and the rainwater or the like comes into contact with the DPF 53 and steam. Can be avoided. The exhaust heat cover 100 can cover the gap 88 formed between the bonnet 80 and the operation unit 20. That is, the bonnet 80 can be made compact and the aesthetics of the tractor A2 can be improved at the same time.

In addition, the front end edge of the exhaust heat cover 100 arranged close to the pivotal support and the rear end edge of the closed bonnet 80 are arranged in the vertical direction, and a sealing property is provided between them. Since the sealing material 126 for holding is provided, the sealing performance of the connecting portion between the front end edge of the exhaust heat cover 100 and the rear end edge of the bonnet 80 is ensured through the sealing material 126. It is possible to prevent rainwater and the like from entering from the connecting portion. At this time, the wide front / rear portion 110 of the heat exhaust cover 100 covers the pivot 73 of the pivotal support 71 pivotally supporting the bonnet 80 via the opening / closing arm 75 from above, and the front end edge of the wide front / rear wide portion 110 is supported on the pivot 73. Since the front end edge part of the front and rear wide part 110 and the rear end edge part 89 of the ceiling surface 81a of the bonnet 80 can be arranged close to the pivot 73, the connection is possible. It is possible to prevent the positions from varying. As a result, the connecting portion can be sealed with high accuracy. That is, it is possible to ensure good sealing performance.

Furthermore, since the exhaust heat flowing out from the motor unit 11 through the exhaust heat hole 130 is guided toward the outside via the exhaust heat guide piece 140, the exhaust heat is directed rearward and outward. It is fluidized and does not directly hit an operator operated by the operation unit 20. Therefore, even when the operation unit 20 is not covered with the cabin C, the comfortability of the operator can be ensured satisfactorily.

In addition, the exhaust heat cover 100 is formed of a material (for example, an iron plate) that has thermal conductivity that allows heat radiation to the atmosphere and rigidity that is difficult to be damaged by falling objects such as stones. Due to the conductivity, the heat generated by the motor unit 11 can be radiated to the atmosphere steadily, and the rigidity of the exhaust heat cover 100 can prevent damage caused by falling objects such as stones. Can be secured.

Next, a configuration that is a feature of the tractor A, that is, a configuration of the radiator screen 46 will be described.

[Description of radiator screen configuration]
As shown in FIGS. 23 and 24, the radiator screen 46 is disposed in an upright manner through the guide frame 130 so as to cover the front surface of the radiator 45, and dust and dust are placed on the front surface of the radiator 45. Prevents adhesion.

In other words, the radiator screen 46 is formed by stretching a plurality (two in this embodiment) of screen forming pieces 100 in a vertical stacking manner via the guide frame 130. The screen-forming pieces 100 are all formed in the same shape and can be arranged at either upper or lower level. In the present embodiment, the radiator screen 46 is formed by disposing two screen forming pieces 100 formed in the same shape on the upper part (upper position) and the lower part (lower position) of the guide frame 130. The upper stage position is set at a position slightly higher than the upper end of the portion of the side cover 84 disposed on the left side of the radiator screen 46. That is, at least the upper screen forming piece 100 can be pulled out to the left without interfering with the side cover 84.

Each screen forming piece 100 includes a square net-shaped forming book piece 102, a sliding guide rail 104 provided along the extending direction of the upper end edge portion of the forming book piece 102, and a lower end edge portion of the forming book piece 102. A slide rail 106 provided along the extending direction, and a vertical slide rail 108 provided along the extending direction at the left and right side edges of the formed book piece 102 are provided. In this way, each screen forming piece 100 is formed by surrounding the periphery of the rectangular net-shaped forming book piece 102 in a frame shape with the metal rails 104, 106, 108, 108, and stretching the forming book piece 102. Reinforced while retaining shape.

The slide rail 106 is slidable along the slide guide rail 104 of the screen forming piece 100 arranged immediately below. That is, the slide rail 106 is formed in a U-shape when viewed from the side, and is attached by being externally fitted to the lower end edge of the formed book piece 102. The sliding guide rail 104 is formed by a lower edge portion 114 of the front rail forming piece 110 extending in the left and right direction and a lower edge portion 116 of the rear rail forming piece 112 extending in the left and right direction. Is sandwiched from the front-rear direction. Then, the upper edge 118 of the front rail forming piece 110 is formed into a stepped ridge to the front, and a sliding rail fitting concave ridge 122 is formed between the upper edge 120 of the rear rail forming piece 112. is doing. The slide rail insertion recess 122 is fitted with the slide rail 106 of the screen forming piece 100 arranged on the upper side from the side (in the present embodiment, the left side) and the slide rail insertion recess 122. It can be slid along. Further, the vertical slide rail 108 is formed in a U shape in a plan view, and is formed between the side end portions of the slide rail 106 and the slide guide rail 104 on the left and right end edges of the formed book piece 102, respectively. It is fitted and attached. At the left and right end portions of the sliding guide rail 104, suspension projecting pieces 124 projecting outward from the longitudinal sliding rail 108 are extended.

The screen forming piece 100 in the lower stage excluding the uppermost stage is slidable only in the vertical direction through the guide frame body 130. That is, the uppermost screen (in this embodiment, the upper screen)
The forming piece 100 is slidable in the lateral direction (in the present embodiment, the left direction) and can be removed. The lower screen forming piece 100 is sequentially slid upward through the guide frame 130 to the position where the uppermost screen forming piece 100 is disposed, and is also slid in the lateral direction (left side direction). It can be removed.

More specifically, the guide frame body 130 includes a pair of left and right vertically extending pieces 132 formed by extending vertically so as to have substantially the same vertical width as the radiator 45, and the upper ends of the vertically extending pieces 132. The upper connecting piece 134 formed by extending further upward from the upper portion, the lower connecting piece 136 formed by extending further downward from the lower end portion of the vertically extending piece 132, and the lower edge of the vertically extending piece 132 (this In the embodiment, a vertical rail-forming piece 138 formed by extending from the lower half edge) to the front inward and a fixed-side connecting piece 140 formed by extending forward from the upper connecting piece 134. Are formed symmetrically to the left and right lines.

A pair of left and right connecting projections 164 project upward from the left and right front portions of the upper end surface of the radiator 45, respectively. A radiator support 166 is provided at the lower end of the radiator 45. The upper connecting piece 134 of the vertically extending piece 132 is connected to the pair of left and right connecting protrusions 164 by the connecting bolt 170, while the lower connecting piece 136 of the vertically extending piece 132 is connected to the connecting bolt 172 on the radiator support base 166. It is connected by. In this way, a pair of left and right vertically extending pieces 132 are attached in parallel to each other at the left and right side edge portions on the front side of the radiator 45 with an interval of the left and right widths of the screen forming piece 100. Reference numeral 174 denotes a synthetic resin material such as urethane filled in a gap formed between the left and right edge portions on the front side of the radiator 45 and the pair of left and right vertically extending pieces 132, and the radiator is passed through the gap by the synthetic resin material 174. Dust and the like are prevented from entering between 45 and the radiator screen 46.

A movable side connecting piece 142 is provided on one side upper part (in this embodiment, left upper part) of each screen forming piece 100. On the other hand, each guide frame body 130 is provided with a fixed-side connecting piece 140. A movable-side coupling piece 142 provided on the upper left side of the uppermost screen forming piece 100 is connected to the left-side fixed-side coupling piece 140 so that the movable-side coupling piece 142 can be connected and released freely from the left side. The forming piece 100 can be fixed.

More specifically, the movable side connecting piece 142 has a base end attaching piece 144 formed in a plate shape on the upper part of the front surface of the left vertical sliding rail 108 attached in a surface contact state. From the inner edge portion of the base end mounting piece 144, the side of the opening side edge portion of the vertical rail forming piece 138 is bent forward to form a movable side connecting piece 146. The movable side connecting piece 146 is formed with a vertically long connecting hole 148.

Each fixed-side connection piece 140 includes a base attachment piece 150 formed in a side view portal shape, and a fixed-side connection main piece 151 formed in a rectangular plate shape extending forward from the distal end portion of the base attachment piece 150. , Formed from. The base mounting piece 150 is connected to the front surface of the upper connecting piece 134 with the rear surface of the base in surface contact. The base mounting piece 150 formed in a side view portal shape is arranged so as to bypass the upper side of the sliding guide rail 104, and the sliding guide rail 104 of the screen forming piece 100 is located below the base mounting piece 150. Is slidable in the left-right direction.

Then, the rectangular plate-like fixed-side coupling main piece 151 is protruded forward from the distal end portion of the base mounting piece 150 with its side face directed in the left-right direction. A circular insertion hole 154 that opens in the left-right direction is formed in the central portion of the fixed-side coupling main piece 151. On one side (left side in the present embodiment), the fixed release connecting piece 151 is attached with the fixing release body 152 facing outward (toward the left side).

The fixing release body 152 is a cylindrical fixing release piece 156 that is coaxially attached to the insertion hole 154 on the inner surface of the fixed side connecting book piece 151, and is rotatably attached to the fixation release book piece 156, and the insertion hole 154 The rotary support body 158 protruded to the left side through the inside, and the plate-shaped engagement piece 160 attached to the front-end | tip part of the rotary support body 158 is comprised. The rotation support body 158 is formed in a bifurcated shape by bending a belt-shaped leaf spring at the center portion, and at each tip portion is bent into a folded hook shape to form a fitting piece 162. A fitting piece 162 is fitted to the inner edge of the piece 156 so as to be slidable in the circumferential direction of the fixed release piece 156. The plate-like engagement piece 160 is attached to the tip of the rotation support body 158 with its surface substantially parallel to the surface of the belt-like rotation support body 158, and the axis of the unlocking main piece 156 via the rotation support body 158. An engagement piece 160 is arranged on P.

The engaging piece 160 can be rotated around the axis P of the unlocking main piece 156. That is, the position of the engagement piece 160 is changed between a vertically fixed release position aligned with the connection hole 148 of the movable side connection piece 142 and a fixed position horizontally aligned with the movable side connection piece 142. It is free. Here, the connection hole 148 is formed in a vertically long hole that is longer than the double width (diameter) of the maximum width that is the rotation radius of the engagement piece 160. a is the rotation direction of the engagement piece 160.

Further, the engagement piece 160 can be bent and arranged so as to be substantially parallel to the outer surface of the fixed-side coupling main piece 151 via a rotation support body 158 made of a leaf spring.

By configuring the unlocking body 152 in this way, when the screen forming piece 100 arranged in the lower stage is slid from the left side on the upper part of the guide frame body 130, the movable side connecting book of the screen forming piece 100 in the lower stage is arranged. By disposing the piece 146 close to the fixed-side connecting main piece 151, it is necessary to place the lower screen forming piece 100 downward and slide through the pair of left and right vertical rail forming pieces 138. At this time, the movable piece 146 of the lower screen forming piece 100 is fixed by bending the engaging piece 160 so as to be substantially parallel to the outer surface of the fixed piece 151. It is possible to dispose them close to the side connecting book pieces 151.

Next, a procedure for attaching the upper and lower screen forming pieces 100 to the guide frame 130 will be described.
(1) The screen forming piece 100 arranged in the lower stage is arranged by sliding on the upper part of the guide frame 130 from the left side to the right side. At this time, the movable piece 146 of the lower screen forming piece 100 is fixed to the fixed side link by arranging the engaging piece 160 so as to be substantially parallel to the outer surface of the fixed side piece 151. Arranged close to the book 151.
(2) The lower screen forming piece 100 is slid down through the pair of left and right vertical rail forming pieces 138 and arranged in the lower stage. At this time, the formed book is interposed between the pair of left and right vertical slide rails 108 via suspension protrusions 124 that project outward from the left and right ends of the slide guide rail 104. The piece 102 is arranged in a suspended state.
(3) The sliding rail 106 of the upper screen forming piece 100 is fitted into the sliding guide rail 104 of the lower screen forming piece 100 from the left side, and the sliding rail 106 fitted into the sliding guide rail 104 is inserted. Then, the upper screen forming piece 100 is slid rightward.
(4) The engaging piece 160 of the fixing release body 152 attached to the fixed-side connecting main piece 151 is rotationally arranged at the fixing releasing position, and the upper screen forming piece 100 aligned with the engaging piece 160 at the fixing releasing position. By fitting the connecting hole 148 formed in the movable side connecting piece 146 to bring the movable side connecting piece 146 into surface contact with the fixed side connecting piece 151, the engaging piece 160 is rotated and arranged at a fixed position. The lateral sliding of the upper screen forming piece 100 in the left-right direction is restricted (locked). At the same time, the upper screen forming piece 100 that is locked restricts (locks) upward sliding of the lower screen forming piece 100.

Next, a procedure for removing the upper and lower screen forming pieces 100 from the guide frame 130 will be described. Basically, the procedure opposite to the above-described sliding arrangement (attachment) procedure is followed.
(1) The engagement piece 160 of the fixation release body 152 attached to the fixed-side coupling main piece 151 is rotationally arranged at the fixation release position, and the engagement piece 160 at the fixation release position and the movable side of the upper screen forming piece 100 The connecting holes 148 formed in the connecting piece 146 are aligned. That is, the lock of the upper screen forming piece 100 by the fixing release body 152 is released.
(2) Along with the sliding guide rail 104 of the lower screen forming piece 100, the upper screen forming piece 100 is slid laterally to the left via the sliding rail 106 and removed.
(3) The lower screen forming piece 100 is lifted and slid through the pair of left and right vertical rail forming pieces 138 and arranged in the upper stage. At this time, the engaging piece 160 is bent and arranged so as to be substantially parallel to the outer surface of the fixed-side connecting book piece 151, so that the movable-side connecting book of the lower screen forming piece 100 is placed on the engaging piece 160. The lower screen forming piece 100 can be arranged at the upper position without causing the pieces 146 to interfere.
(4) The lower screen forming piece 100 disposed at the upper position is pulled out to the left and removed.

When the radiator screen 46 is formed by stacking two or more screen forming pieces 100 up and down in the up-down direction, only the uppermost screen forming piece 100 can be pulled out to either the left or right, and the others The screen forming pieces 100 are sequentially moved up to the uppermost position and then pulled out to either the left or right. Further, when the radiator screen 46 is formed, the procedure opposite to the above is followed.

In the thus configured radiator screen 46, the upper screen forming piece 100 is slidable in the horizontal direction and can be removed, and the lower screen forming piece 100 is arranged in sequence with the uppermost screen forming piece 100. Since it is slid upward to the installation position (upper position) and is detachable by being slid laterally, even if the intake pipe is disposed directly above the radiator screen 46, the intake pipe However, this does not hinder the removal of the radiator screen 46. Even when the arm or the frame of the work machine is arranged on the side of the radiator screen 46, the frame or the like is lowered by lowering the frame or the like to a position below the arrangement position of the uppermost screen forming piece 100. There is no hindrance to the removal of the radiator screen 46. Even when the large-diameter front wheel 15 is disposed on the side of the radiator screen 46, the front wheel 15 can be moved by placing the uppermost screen forming piece 100 above the upper end of the front wheel 15. There is no hindrance to the removal of the radiator screen 46. Since the radiator screen 46 is formed by being divided into a plurality of screen forming pieces 100, the radiator screen 46 becomes compact and easy to handle, store and manage.

Since the plurality of screen forming pieces 100 are all formed in the same shape, the radiator screen 46 can be formed firmly even if any of the screen forming pieces 100 is stacked in the vertical direction. That is, the screen forming piece 100 can also be used at any step position. Therefore, there is no possibility that the screen forming piece 100 is arranged at an incorrect position. The screen forming piece 100 can be replaced for each screen forming piece 100 in which damage or the like has occurred. That is, it is possible to partially replace each screen forming piece 100 in which breakage or the like has occurred without replacing the entire radiator screen 46. Therefore, the maintenance cost is low.

Moreover, the slide rail 106 provided along the extending direction at the lower end edge of the formed book piece 102.
Is formed so as to be slidable along the sliding guide rail 104 provided along the extending direction of the upper end edge of the main forming piece 102 of the screen forming piece 100 arranged immediately below. The screen-forming piece 100 can be smoothly slid laterally on the screen-forming piece 100 immediately below the screen-forming piece 100 and removed.

Furthermore, since the lower-stage screen forming piece 100 except the uppermost stage is slidable only in the vertical direction via the guide frame body 130, that is, because sliding in the horizontal direction is restricted, When the uppermost screen-forming piece 100 is slid in the horizontal direction, the lower-stage screen-forming piece 100 is slid in the horizontal direction together, and other things (arms and frames of the working machine, front wheels, etc.) There is no problem of interference. The lower screen forming pieces 100 can be smoothly slid to the position where the uppermost screen forming piece 100 is disposed via the guide frame body 130. Removal work can be done easily.

In addition, since the fixed side connecting piece 140 and the movable side connecting piece 142 provided on the uppermost screen forming piece 100 are connected to each other so as to be freely connected and released, the uppermost screen forming piece 100 can be fixed. The uppermost screen forming piece 100 can be fixed easily and firmly by the connecting

pieces

140 and 142, and the radiator screen 46 in which a plurality of screen forming pieces 100 are stacked in the vertical direction can be formed firmly. Thus, the dust removal function of the radiator screen 46 can be secured satisfactorily.

A1, A2 Tractor 10 Airframe frame 11 Motor unit 12 Mission case 20 Operating unit 30,100 Heat exhaust cover 88 Gap 80 Bonnet 34,130 Heat exhaust hole

Claims

A work vehicle including a motor unit having an engine and the like, and a driving unit disposed behind the motor unit,
A work vehicle characterized in that an exhaust heat cover having an exhaust heat hole is interposed in a gap formed between a bonnet that covers a prime mover part and an operation part.
The bonnet is pivotally supported at the rear part of the prime mover part via the opening and closing arm, and can be opened and closed in the vertical direction around the pivot part.
The exhaust heat cover covers the pivot part from above and is arranged with the front edge of the exhaust heat cover close to the pivot part,
The rear end edge of the closed bonnet and the front end edge of the exhaust heat cover are arranged by being superposed in the vertical direction, and a sealing material for maintaining sealing performance is interposed between them. The work vehicle according to claim 1.
The exhaust heat hole is an elongated hole extending in the front-rear direction, and the front end is disposed closer to the inner side, the rear end is disposed closer to the outer side, and a heat exhaust guide piece projects from the rear end edge,
3. The work vehicle according to claim 1, wherein the exhaust heat flowing out from the prime mover through the exhaust heat hole is guided outward through the exhaust heat guide piece.
The exhaust heat cover has a cover front part that covers the pivot part from above, and a cover rear part that covers the pivot part from behind,
The work vehicle according to claim 1 or 2, wherein the rear portion of the cover is formed in a recess extending in the left-right direction, and a heat exhaust hole formed as an elongated hole is formed in the rear portion of the cover in the left-right direction.
The work according to any one of claims 1 to 4, wherein the exhaust heat cover is formed of a material having thermal conductivity capable of heat radiation to the atmosphere and rigidity that is difficult to be damaged by falling objects such as stones. car.