CN111376991B - Working vehicle - Google Patents

Abstract

The invention provides a working vehicle capable of restraining heat generated in an engine hood from being retained in a spacer. A tractor (1) is provided with an engine cover (100), a cabin (12) arranged behind the engine cover (100), and a spacer (200) arranged between the engine cover (100) and the cabin (12), wherein the spacer (200) is provided with an outer surface part (210) covering the upper part and the left and right sides of a space (R) behind the engine cover (100), and a top surface exhaust port (212) and a side surface exhaust port (214) which are arranged on the outer surface part (210) and communicate the space (R) with the outside of the spacer (200).

Description

Working vehicle

Technical Field

The present invention relates to a technique of a work vehicle.

Background

Conventionally, a technique of a work vehicle such as a tractor having an engine cover and a cabin is known. For example, as described in patent document 1.

Patent document 1 discloses a tractor having a cabin mounted on a rear portion of an engine cover. Such a tractor may be provided with a predetermined spacer to cover a gap formed between the engine cover and the cabin.

However, if the gap is covered with the spacer, heat generated inside the hood may be accumulated inside the spacer, and a further improvement is desired.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-131157

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above circumstances, and an object to be solved by the present invention is to suppress heat generated inside an engine hood from being trapped inside a spacer.

Means for solving the problems

As described above, the problems to be solved by the present invention will be described below.

That is, according to claim 1, there is provided a work vehicle including an engine hood, a cabin disposed rearward of the engine hood, and a spacer disposed between the engine hood and the cabin, wherein the spacer includes an outer surface portion covering an upper portion and both left and right side portions of a space rearward of the engine hood, and an exhaust port provided in the outer surface portion and communicating the space with an outside of the spacer.

In claim 2, the outer surface portion has an upper surface portion covering an upper side of the space, and the exhaust port includes an upper surface exhaust port provided in the upper surface portion.

In claim 3, an opening portion for introducing air into the interior of the engine hood is provided in the upper surface of the engine hood, and the upper surface exhaust port is disposed so that a position in the left-right direction of at least a part of the upper surface exhaust port coincides with a position in the left-right direction of at least a part of the opening portion.

In claim 4, the outer surface portion has side surface portions covering both right and left sides of the space, and the exhaust port includes a side exhaust port provided in the side surface portion.

In claim 5, the side exhaust port is disposed such that a vertical position of at least a part of the side exhaust port coincides with a vertical position of at least a part of a muffler body disposed inside the hood.

In claim 6, the outer surface portion has side surface portions covering both right and left sides of the space, and the exhaust port is not provided in the side surface portions.

In claim 7, the exhaust port is located rearward of a muffler body disposed inside the hood.

In claim 8, the spacer includes: a protrusion that protrudes forward and is located inside the outer surface portion so as to form a step in front of the outer surface portion; and a front surface portion that connects the outer surface portion and the projection portion and faces forward.

In claim 9, a hole portion that communicates the space with the outside of the spacer is provided in the front surface portion.

In claim 10, the hole portion is formed in an elongated hole shape extending outward from an inner end portion of the front portion.

Effects of the invention

The following effects are exhibited as the effects of the present invention.

In claim 1, the heat generated inside the hood can be prevented from being retained inside the spacer.

In claim 2, the hot gas can be discharged above the spacer.

In claim 3, the temperature inside the hood can be more appropriately reduced.

In claim 4, the hot air can be discharged to the side of the spacer.

In claim 5, the heat generated inside the hood can be more appropriately discharged.

In claim 6, the retention of heat inside the spacer can be suppressed, and the appearance in side view can be improved.

In claim 7, the heat generated inside the engine cover can be more appropriately discharged.

In claim 8, the heat generated inside the engine cover can be more appropriately discharged.

In claim 9, the heat generated inside the engine cover can be more appropriately discharged.

In claim 10, heat can be more appropriately discharged through the hole portion formed relatively large.

Drawings

Fig. 1 is a side view showing the overall structure of a tractor according to a first embodiment of the present invention.

Fig. 2 is a plan view showing the engine cover and the spacer.

Fig. 3 is a perspective view showing the engine cover and the spacer.

Fig. 4 is a perspective view showing an upper surface portion of the engine cover.

Fig. 5 is a perspective view showing the orifice plate portion.

Fig. 6(a) is a side sectional view showing the upper surface portion of the hood before the adhesive application step is performed. Fig. 6(b) is a side sectional view showing the upper surface portion of the hood in the adhesive application step. Fig. 6(c) is a side sectional view showing the upper surface portion of the hood in the adhesive bonding step.

Fig. 7 is a flowchart illustrating a method of manufacturing the intake port.

Fig. 8 is a perspective view illustrating the spacer.

Fig. 9 is a front view showing the spacer.

Fig. 10 is a side sectional view showing the engine cover and the spacer.

Fig. 11 is a perspective view showing a spacer according to a second embodiment of the present invention.

Fig. 12 is a perspective view showing a perforated plate portion of a third embodiment of the present invention.

Description of the symbols

Tractor 1 (working vehicle)

11a muffler body

12 cabin

100 engine cover

120 air inlet

200 spacer

210 external face

211 upper surface part

212 Upper exhaust port (exhaust port)

213 side part

214 side exhaust port (exhaust port)

220 front part

223 hole part

230 projection

And R space.

Detailed Description

Hereinafter, directions indicated by arrows U, D, F, B, L, and R in the drawings will be defined as upper, lower, front, rear, left, and right, respectively, to explain the description.

First, the overall structure of a tractor 1 according to a first embodiment of the present invention will be described with reference to fig. 1.

The tractor 1 mainly includes a machine frame 2, an engine 3, a flywheel housing 4, a clutch housing 5, a transmission 6, a lifter 7, front wheels 8, rear wheels 9, an engine cover 100, a muffler 11, a cabin 12, a steering wheel 13, a seat 14, a spacer 200, and the like.

The body frame 2 is a frame-shaped member formed by appropriately combining a plurality of plate materials. The body frame 2 is disposed at a front lower portion of the tractor 1 such that a longitudinal direction thereof faces a front-rear direction. An engine 3 is fixed to the rear portion of the body frame 2. A flywheel housing 4 is fixed to the rear of the engine 3. A clutch housing 5 is fixed to the rear of the flywheel housing 4. A transmission case 6 is fixed to the rear of the clutch housing 5. A lifting device 7 is arranged at the rear part of the gearbox 6. Various working devices (e.g., a cultivator) can be attached to the lifting device 7.

The front portion of the body frame 2 is supported by a pair of left and right front wheels 8 via a front axle mechanism (not shown). The transmission 6 is supported by a pair of left and right rear wheels 9 via a rear axle mechanism (not shown).

Further, the engine 3 is covered by an engine cover 100. A muffler 11 for discharging exhaust gas of the engine 3 is disposed on the left side of the engine cover 100. A cabin 12 is provided behind the engine cover 100. A steering wheel 13, a seat 14, various operation elements, pedals, and the like are disposed inside the cabin 12. A spacer 200 is disposed between the engine cover 100 and the cabin 12.

The power of the engine 3 can be transmitted to the front wheels 8 via the front axle mechanism and can be transmitted to the rear wheels 9 via the rear axle mechanism after being shifted by a transmission (not shown) housed in the transmission 6. In this way, the front wheels 8 and the rear wheels 9 are rotationally driven by the power of the engine 3, and the tractor 1 can travel. Further, the working device attached to the lifting device 7 can be driven by the power of the engine 3.

The details of the muffler 11 will be described below with reference to fig. 1 and 2.

The muffler 11 includes a muffler body 11a and an exhaust pipe 11 b. The muffler body 11a realizes silencing of sound generated by exhaust of the engine 3 and purification of exhaust gas. The muffler body 11a includes an exhaust gas purification device (dpf). The muffler body 11a is disposed in the internal space of the hood 100. As shown in fig. 2, the muffler body 11a is disposed on the left rear side in the internal space of the hood 100. As shown in fig. 1, the muffler body 11a is disposed above the engine 3.

The exhaust pipe 11b discharges the exhaust gas passing through the muffler body 11a to the outside. One end of the exhaust pipe 11b is connected to the muffler body 11a in the internal space of the hood 100, and the other end is located outside the hood 100.

Next, details of the engine cover 100 will be described with reference to fig. 1 to 5.

The engine cover 100 is formed in a shape long in the front-rear direction. The engine cover 100 includes an upper surface portion 110, a front surface portion 160, and a side surface portion 170.

The upper surface portion 110 shown in fig. 2 and 3 covers the upper portion of the internal space of the hood 100. The upper surface portion 110 has a substantially rectangular shape in plan view. The front portion of the upper surface portion 110 is formed in a shape tapered toward the front in a plan view. The upper surface portion 110 is formed in a curved surface shape when viewed from the front. The upper surface 110 is formed in a shape inclined downward toward the front. The upper surface portion 110 includes an air inlet 120. Further, the detailed description of the intake port 120 will be described later.

The front surface portion 160 covers the front of the internal space of the hood 100. The side surface portions 170 cover both right and left sides of the internal space of the engine cover 100. As shown in fig. 1 and 3, the side surface portion 170 has a substantially rectangular shape with a rear lower corner cut away in a side view. Thus, the side surface part 170 is formed in a shape in which the vertical dimension of the rear part is smaller than the vertical dimension of the front part. In addition, the side surface portion 170 is formed in a curved surface shape when viewed from the front.

In the internal space of the engine cover 100, devices such as an engine fan (not shown), an air cleaner (not shown), and a radiator (not shown) are disposed in addition to the engine 3 and the muffler body 11 a.

The intake port 120 shown in fig. 2 to 6 introduces air into the internal space of the engine cover 100. The air inlet 120 includes an opening 130, a perforated plate 140, and an adhesive bonding layer 150.

The opening 130 shown in fig. 4 and 6 is an opening that vertically penetrates the upper surface portion 110 of the hood 100. The opening 130 is provided in the front portion of the upper surface 110. The opening 130 is provided at a position forward of the engine 3. The opening 130 has a substantially rectangular shape in plan view. A pair (two) of the openings 130 are provided in parallel on the left and right.

The perforated plate portion 140 shown in fig. 2, 3, 5, and 6 covers the opening 130 from the inside. The perforated plate portion 140 is formed of a punched metal plate having a hole portion penetrating in the thickness direction. As the punched metal plate in which the hole plate portion 140 is formed, various structures such as a punched metal plate in which a plurality of circular holes are formed, a punched metal plate formed in a mesh shape, and the like can be employed. The perforated plate portion 140 includes a cover portion 141 and an adhered portion 142.

The cover 141 covers the opening 130. Cover 141 is formed with a hole as a whole. The cover 141 is formed in a shape corresponding to the shape of the opening 130. That is, cover 141 is formed in a shape having substantially the same size as opening 130 in a plan view.

The cover portion 141 is provided with a pair (two) of left and right with respect to one perforated plate portion 140 so as to correspond to the pair of openings 130. As shown in fig. 6 c, the outer surface (upper surface) of cover 141 is formed to be flush with the upper surface of upper part 110 of hood 100. That is, the upper surface of cover 141 is formed in a curved surface shape corresponding to upper surface 110. With this configuration, the appearance of the intake port 120 can be further improved.

The bonded portion 142 is a portion bonded to the inner surface of the upper surface portion 110. The bonded joint 142 has a hole formed integrally in the same manner as the cover 141. As shown in fig. 5 and fig. 6(b) and (c), the bonded joint portion 142 is located inside the upper surface portion 110 of the cover portion 141 so as to form a step with respect to the cover portion 141. In other words, the cover 141 is provided so as to protrude upward from the bonded joint 142. The bonded portion 142 is disposed so as to face a portion around the opening 130 on the inner surface (lower surface) of the upper surface portion 110.

The bonded joint portion 142 is formed in a shape corresponding to the front portion of the upper surface portion 110 of the hood 100. Specifically, the bonded portion 142 is formed in a substantially trapezoidal shape whose tip becomes narrower toward the front in a plan view. The bonded joint portion 142 is formed over the entire circumference of the pair of cover portions 141. In the present embodiment, a common bonded portion 142 is provided for the pair of cover portions 141. With this configuration, the two openings 130 can be covered with one perforated plate portion 140, and the number of components can be reduced.

The bonded joint portion 142 is formed such that the surface roughness of the bonding surface (upper surface) is thicker than the surface roughness of the outer surface (upper surface) of the cover portion 141. That is, the bonded joint portion 142 is formed with lower processing accuracy than the cover portion 141. Specifically, the bonded part 142 is formed to have a surface roughness (maximum height Rz) larger than that of the cover part 141. The bonded portion 142 has a surface roughness (maximum height Rz) of 100 μm or more.

The adhesive bonding layer 150 shown in fig. 6(b) and (c) adhesively bonds the upper surface portion 110 of the hood 100 to the apertured plate portion 140. The adhesive bonding layer 150 is formed between the portion around the opening 130 on the lower surface of the upper surface portion 110 and the upper surface of the bonded portion 142. The adhesive bonding layer 150 is formed of a predetermined adhesive. As the adhesive for forming the adhesive bonding layer 150, various adhesives capable of adhesively bonding metal materials can be used. The type of the adhesive is preferably an epoxy resin type, a silicone resin type, or a vinyl acetate resin type, and particularly preferably an epoxy resin type. The adhesive is cured to fix the apertured plate portion 140 to the engine cover 100. The adhesive bonding layer 150 includes a non-adhesive bonding portion 151.

The non-adhesive joint 151 is a portion of the adhesive joint layer 150 where the upper surface portion 110 of the engine cover 100 and the perforated plate portion 140 are non-adhesively joined. The non-adhesive bonding portion 151 is formed in a hole shape penetrating the adhesive bonding layer 150 in the up-down direction. The non-adhesive joint 151 is formed at least at one location. In the illustrated example, the non-adhesive joint 151 is formed between the pair of openings 130. Further, the non-adhesive bonding portion 151 may be formed in various places in the adhesive bonding layer 150, without being limited to this manner.

Hereinafter, a method for manufacturing the intake port 120 configured as described above will be described with reference to fig. 6 and 7.

As shown in fig. 7, the method for manufacturing the intake port 120 mainly includes a molding step S1, an adhesive applying step S2, and an adhesive bonding step S3.

The forming step S1 is a step of forming the apertured plate portion 140. In the forming step S1, a flat plate-like punching metal plate is subjected to press working using a predetermined die corresponding to the shape of the perforated plate portion 140. Thereby, the orifice plate portion 140 is formed. In the present embodiment, since the pair of cover portions 141 are provided for one perforated plate portion 140, the perforated plate portion 140 covering the pair of openings 130 can be formed by one-time processing using one mold.

As shown in fig. 6(a) and (b), the adhesive application step S2 is a step of applying an adhesive to at least one of the upper surface portion 110 and the perforated plate portion 140 of the hood 100. In the figure, an example is shown in which an adhesive is applied to a portion around the opening 130 in the lower surface of the upper surface portion 110. Further, without being limited to this, the adhesive may be applied to the upper surface of the bonded portion 142 of the perforated plate portion 140. In the adhesive application step S2, the adhesive may be applied by removing the portion where the non-adhesive joint 151 is formed.

The adhesive bonding step S3 is a step of bonding the apertured plate portion 140 to the engine hood 100 so as to cover the opening portion 130. In the adhesive bonding step S3, as shown in fig. 6(b) and (c), the adhesive applied in the adhesive application step S2 is used to bond the portion around the opening 130 on the lower surface of the upper surface portion 110 and the upper surface of the bonded portion 142 of the apertured plate portion 140. Thereby, the adhesive bonding layer 150 is formed between the lower surface of the upper surface portion 110 and the upper surface of the bonded portion 142. The adhesive is cured to fix the apertured plate portion 140 to the engine cover 100. Thereby, the intake port 120 is constituted.

According to the manufacturing method described above, since the perforated plate portion 140 is fixed to the engine hood 100 by the adhesive, the intake port 120 can be formed more easily than in the case where the perforated plate portion 140 is fixed to the engine hood 100 by, for example, welding. Further, it is possible to suppress the occurrence of thermal deformation in the perforated plate portion 140 and the engine cover 100 due to heat associated with the welding.

In the case where the perforated plate portion 140 and the engine cover 100 are joined by welding, the materials of the perforated plate portion 140 and the engine cover 100 are limited to those that can be welded to each other. On the other hand, according to the manufacturing method described above, materials other than the materials that can be welded can be used as the materials of the apertured plate portion 140 and the engine cover 100, and the degree of freedom of the materials can be improved.

Further, for example, in the case where the holed plate portion 140 is fixed to the engine hood 100 by spot welding, a trace of welding is formed on the outer surface of the engine hood 100, but according to the manufacturing method as described above, such a trace of welding can be suppressed from being formed, and the appearance can be improved.

Further, in the case of welding the perforated plate portion 140 to the engine hood 100, if the machining accuracy of the upper surface of the adhesively bonded portion 142 is low (surface roughness is large), the perforated plate portion 140 may be deformed and bonded by a gap formed between the upper surface of the adhesively bonded portion 142 and the inner surface of the engine hood 100, and it is difficult to bond the perforated plate portion 140 with good appearance. On the other hand, according to the above-described manufacturing method, the gap is filled with the adhesive bonding layer 150, so that the panel portion 140 and the engine cover 100 can be bonded to each other with good appearance. In addition, as described above, by making the surface roughness of the bonded portion 142 relatively large, the bonding strength of the adhesive bonding layer 150 can be improved.

For example, in the case of fixing the holed plate portion 140 and the engine cover 100 with screws or rivets, a space for fastening screws or the like is necessary, but according to the above-described manufacturing method, the space is not necessary.

Next, the details of the chamber 12 will be described with reference to fig. 1 and 3.

A control panel (not shown) on which a steering wheel 13, pedals, and the like are provided is disposed in the cabin 12. The control panel internally houses various electrical components related to the operation of the tractor 1. The control panel is attached to a panel portion 12a constituting the front surface of the cabin 12.

As shown in fig. 3, the panel portion 12a is disposed at the center in the left-right direction of the front surface of the cabin 12. The panel portion 12a is formed in a plate shape having a thickness direction along the front-rear direction. The panel portion 12a has a control panel mounted on the rear surface. A predetermined space R is formed between the front surface of the panel portion 12a and the rear end portion of the hood 100.

Next, details of the spacer 200 will be described with reference to fig. 2, 3, and 8 to 10.

The spacer 200 covers the space R. The spacer 200 is formed in a shape of a door frame corresponding to the rear ends of the upper surface portion 110 and the side surface portion 170 of the hood 100. As shown in fig. 2, the spacer 200 is located rearward of the muffler body 11a inside the hood 100. The spacer 200 includes an outer surface portion 210, a front surface portion 220, a protrusion 230, and an attachment portion 240.

The outer surface portion 210 covers the upper side and both left and right sides of the space R behind the engine cover 100. The outer surface portion 210 includes an upper surface portion 211 and a side surface portion 213.

The upper surface portion 211 covers the space R. The upper surface portion 211 is formed in a plate shape with the thickness direction along the vertical direction. The upper surface portion 211 has a substantially rectangular shape in plan view. The upper surface portion 211 is formed in a shape corresponding to the upper surface portion 110 of the hood 100. Specifically, the upper surface portion 211 is formed in a curved surface shape having a center in the left-right direction as a vertex in a plan view. The upper surface portion 211 is provided with an upper surface air outlet 212.

The upper surface exhaust port 212 communicates the space R with the outside (space on the upper side) of the upper surface portion 211. The upper surface exhaust port 212 is formed in the center of the upper surface portion 211 in the lateral direction. As shown in fig. 2 and 3, the position in the left-right direction of at least a part of the upper surface exhaust port 212 coincides with the position in the left-right direction of at least a part of the opening 130 of the engine cover 100. In the illustrated example, the left and right positions of the pair of openings 130 are arranged to be accommodated within the left and right width of the upper surface exhaust port 212.

As shown in fig. 2, the left-right position of the left side portion of the upper surface exhaust port 212 coincides with the left-right position of the right side portion of the muffler body 11 a. The upper surface exhaust port 212 includes an opening 212a and a cover 212 b.

The opening 212a is an opening that vertically penetrates the upper surface 211. The opening 212a is formed in a rectangular shape that is long in the left-right direction in a plan view.

The cover portion 212b covers the opening portion 212a from the inside. The cover portion 212b is formed of a perforated plate-like member having a plurality of holes penetrating vertically. As the perforated plate member, a punched metal plate similar to the perforated plate portion 140 can be used. The perforated plate member is not limited to the punched metal plate, and various perforated plate members can be used.

The side surface portions 213 cover both right and left sides of the space R. The side surface portions 213 are provided in a pair extending downward from both ends in the left-right direction of the upper surface portion 211. The side surface portion 213 is formed in a plate shape having a thickness direction along the left-right direction. The side surface portion 213 has a substantially rectangular shape in side view. The corners of the side surface 213 and the upper surface 211 are formed in a curved surface shape.

The side surface portion 213 is formed in a shape corresponding to the side surface portion 170 of the engine cover 100. Specifically, the upper portion of the side surface portion 213 has a curved surface shape when viewed from the front. In addition, the lower portion of the side surface portion 213 is formed in a shape of two flat surfaces curved with the vertical intermediate portion as a vertex when viewed from the front. The boundary between the upper portion and the lower portion of the side surface portion 213 is slightly curved. The side surface portion 213 includes a side surface exhaust port 214.

The side air outlet 214 communicates the space R with the outside (the space on the side) of the side surface portion 213. The side exhaust port 214 includes a first side exhaust port 215 and a second side exhaust port 216.

The first side exhaust port 215 is provided in an upper portion of the side surface 213. As shown in fig. 10, the vertical position of at least a part of the first side exhaust port 215 coincides with the vertical position of at least a part of the muffler body 11a inside the hood 100. Specifically, the vertical position of the lower portion of the first side exhaust port 215 coincides with the vertical position of the upper portion of the muffler body 11 a. The first side exhaust port 215 includes an opening 215a and a cover 215 b.

The opening 215a is an opening penetrating the upper portion of the side surface 213. The opening 215a has a rectangular shape elongated in the vertical direction in a side view.

The cover portion 215b covers the opening portion 215a from the inside. The cover portion 215b is formed of a plate-like member having holes similar to the cover portion 212b of the upper surface exhaust port 212.

The second side exhaust port 216 is provided in a lower portion of the side surface 213. The second side exhaust port 216 includes an opening portion 216a and a cover portion 216 b.

The opening 216a is an opening penetrating the lower portion of the side surface 213 in the right and left directions. The opening 216a has a rectangular shape that is long in the vertical direction in side view.

The cover portion 216b covers the opening portion 216a from the inside. The cover portion 216b is formed of a plate-like member having holes similar to the cover portion 212b of the upper surface exhaust port 212.

The front portion 220 is provided at the front end of the outer portion 210 and faces forward. Front portion 220 includes upper front portion 221, lateral front portion 222, and hole 223.

The upper front surface 221 is formed to extend inward (downward) from the front end of the upper surface 211. The upper front surface 221 is formed in a plate shape with the thickness direction oriented in the front-rear direction. The upper end of the upper front surface 221 is formed in a shape corresponding to the shape of the upper surface 211. The lower end of the upper front surface 221 is formed in a linear shape extending in the horizontal direction.

The side front portion 222 is formed to extend inward (leftward in the right side portion 213 and rightward in the left side portion 213) from the front end portion of the side portion 213. The side front face portion 222 is formed in a plate shape with the thickness direction oriented in the front-rear direction. The outer end and the inner end of the side front part 222 are formed in shapes corresponding to the shapes of the side parts 213.

The hole 223 is a hole penetrating the front surface 220 in the front-rear direction. The hole 223 is formed in an elongated hole shape extending outward from the inner end of the front part 220. The hole 223 is formed in a cutout shape that opens inward in the front portion 220. The front face 220 includes a plurality of holes 223.

Specifically, as shown in fig. 8 and 9, the hole 223 is provided in the upper front surface portion 221 at a position corresponding to the apex of the curved surface of the upper surface portion 211. The hole 223 is provided at a position corresponding to the apex of the curved surface at the boundary between the upper surface 211 and the side surface 213. The hole 223 is provided at the side front face 222 at a position corresponding to the boundary between the upper portion and the lower portion of the side face 213. The hole 223 is provided at the lateral side front face 222 at a position corresponding to the apex of the curved portion of the lower portion of the side face 213.

The protrusion 230 is provided to protrude forward from an inner end portion of the front portion 220. In other words, the protrusion 230 is connected to the front end of the outer surface 210 via the front surface 220. The protrusion 230 is positioned inward of the outer surface 210 so as to form a step in front of the outer surface 210. The projection 230 includes an upper side projection 231 and a side projection 232.

The upper side protrusion 231 is a portion protruding forward from the lower end of the upper side front surface 221. The upper side protrusion 231 is formed in a plate shape with its thickness direction directed in the vertical direction. The upper protrusion 231 is formed in a shape corresponding to the lower end of the upper front surface 221. As shown in fig. 10, the front-rear direction position of the front end portion of the upper side projecting portion 231 substantially coincides with the front-rear direction position of the rear end portion of the hood 100.

The lateral side protrusion 232 protrudes forward from an inner end portion of the lateral side front surface portion 222. The lateral protrusions 232 are formed in a plate shape with the thickness direction oriented in the left-right direction. The side protrusion 232 is formed in a shape corresponding to the inner end of the side front surface 222. The corners of the side protrusions 232 and the upper protrusions 231 are formed in a curved surface shape. The protruding dimension of the lateral protrusion 232 is formed to be larger than the protruding dimension of the upper protrusion 231. As shown in fig. 10, the front-rear direction position of the front end portion of the side projecting portion 232 is located forward of the front-rear direction position of the rear end portion of the hood 100.

The mounting portion 240 is fixed to the panel portion 12a of the cabin 12. The mounting portion 240 includes an upper mounting portion 241 and a side mounting portion 242.

The upper mounting portion 241 extends downward from the lower surface of the upper surface portion 211. The upper attachment portions 241 are provided in a pair on both left and right sides of the upper portion 211. The upper mounting portion 241 is disposed obliquely so as to face inward in the left-right direction as it faces downward. The lower end of upper mounting portion 241 is fixed to the front surface of panel portion 12 a.

The side attachment portion 242 is provided to extend inward from the inner surface of the side surface portion 213. The side mounting portion 242 is disposed between the first side exhaust port 215 and the second side exhaust port 216. The inner end portion of the side-side mounting portion 242 is fixed to the front surface of the panel portion 12 a.

The spacer 200 configured as described above covers the space R behind the hood 100, and can suppress heat generated inside the hood 100 from being trapped inside the spacer 200.

That is, the air introduced into the interior of the engine cover 100 through the intake port 120 is sent rearward by the engine fan. A part of the air sent to the rear takes heat from the muffler body 11a and the like and is sent to the space R behind the hood 100.

The air (hot gas) delivered to the space R is discharged through the upper air outlet 212 and the side air outlet 214 (the first side air outlet 215 and the second side air outlet 216). This can reduce the temperature inside the engine cover 100. In addition, excessive heat transfer to the electrical components disposed in the compartment 12 behind the spacer 200 can be suppressed.

Further, the left-right direction position of a part of the upper surface air outlet 212 coincides with the left-right direction position of a part of the pair of openings 130. This makes it possible to facilitate the formation of a front-rear direction air flow that is introduced from the opening 130 and discharged from the upper surface exhaust port 212 via the fan in the hood 100, and to efficiently cool the interior of the hood 100.

Further, the left-right direction position of a part of the upper surface exhaust port 212 coincides with the left-right direction position of a part of the muffler body 11 a. This makes it possible to quickly discharge the air deprived of heat from the muffler body 11a, which is relatively likely to generate heat, through the upper surface exhaust port 212.

Further, the vertical position of a part of the first side exhaust port 215 coincides with the vertical position of at least a part of the muffler body 11 a. This makes it possible to quickly discharge the air deprived of heat from the muffler body 11a, which is relatively likely to generate heat, through the first side exhaust port 215.

Further, by providing the front surface portion 220 and the protrusion 230 so as to form a step with respect to the outer surface portion 210, the surface area of the spacer 200 can be increased, and heat can be appropriately dissipated. Further, by forming a step with respect to the outer surface portion 210, the flow of air circulating in the front-rear direction is disturbed inside the engine cover 100, and the air can be easily guided to the upper surface exhaust port 212 opening upward and the side surface exhaust ports 214 opening to both the left and right sides.

Further, by providing the hole 223 in the front portion 220, heat can be more appropriately discharged through the hole 223 in addition to the top surface exhaust port 212 and the side surface exhaust port 214.

The spacer 200 configured as described above can be formed, for example, as follows.

The outer surface portion 210 and the front surface portion 220 can be formed by appropriately bending a metal plate material. In the present embodiment, since the hole 223 is formed in the front portion 220, the front portion 220 is configured to be easily curved with respect to the outer portion 210, and to be curved with the portion where the hole 223 is formed as a vertex.

The protrusion 230 can be formed by fixing a metal plate material bent to correspond to the shape of the front face 220 to the front face 220 by welding or the like.

The top exhaust port 212 and the side exhaust port 214 can be formed as follows: the cover portions 212b, 215b, and 216b are fixed to the inner surfaces of the upper surface portion 211 and the side surface portions 213 so as to cover the opening portions 212a and 216a of the upper surface portion 211 and the opening portions 215a and 216a of the side surface portions 213 from inside. The cover portions 212b, 215b, and 216b can be fixed by welding. The cover portions 215b and 216b may be fixed using an adhesive in the same manner as the intake port 120 of the hood 100.

As described above, the tractor 1 (work vehicle) of the present embodiment includes:

an engine cover 100;

a cabin 12 disposed behind the engine cover 100; and

a spacer 200 disposed between the engine cover 100 and the cabin 12,

the spacer 200 includes:

an outer surface portion 210 that covers the upper side and both left and right sides of the space R behind the hood 100; and

and exhaust ports (an upper exhaust port 212 and a side exhaust port 214) provided in the outer surface portion 210 and communicating the space R with the outside of the spacer 200.

With this configuration, heat generated inside hood 100 can be prevented from being trapped inside spacer 200. That is, the heat generated inside the hood 100 can be exhausted through the exhaust ports (the top exhaust port 212 and the side exhaust port 214) of the spacer 200, and the heat can be suppressed from staying in the spacer 200. This can reduce the temperature inside the engine cover 100. In addition, excessive heat transfer to the electrical components disposed in the cabin 12 behind the spacer 200 can be suppressed.

In addition, the outer surface portion 210 has an upper surface portion 211 covering the upper side of the space R,

the exhaust port includes an upper surface exhaust port 212 provided in the upper surface portion 211.

With this configuration, the hot air can be discharged above the separator 200.

In addition, an opening 130 for introducing air into the interior of the engine cover is provided in the upper surface portion 110 (upper surface) of the engine cover 100,

the upper surface air outlet 212 is disposed such that a position in a left-right direction of at least a part of the upper surface air outlet 212 coincides with a position in a left-right direction of at least a part of the opening 130.

With this configuration, the temperature inside the hood 100 can be reduced more appropriately. That is, the air flow in the front-rear direction introduced from the opening 130 and discharged from the upper surface exhaust port 212 via the engine fan in the engine cover 100 can be easily formed. This enables the inside of the engine cover 100 to be efficiently cooled.

The outer surface portion 210 has side surface portions 213 covering both right and left sides of the space R,

the exhaust port includes a side exhaust port 214 provided in the side surface portion 213.

With this configuration, the hot air can be discharged to the side of the separator 200.

The side exhaust port 214 is disposed such that the vertical position of at least a part of the side exhaust port 214 coincides with the vertical position of at least a part of the muffler body 11a disposed inside the hood 100.

With this configuration, heat generated inside the engine cover 100 can be more appropriately discharged. That is, the air that has taken heat from the muffler body 11a, which is relatively likely to generate heat, can be easily and quickly discharged through the side exhaust port 214.

The exhaust ports (the upper exhaust port 212 and the side exhaust port 214) are located rearward of the muffler body 11a disposed inside the hood 100.

With this configuration, heat generated inside the engine cover 100 can be more appropriately discharged. That is, by discharging heat behind the muffler body 11a, which is relatively likely to generate heat, it is possible to more appropriately discharge heat.

In addition, the spacer 200 includes:

a protrusion 230 that protrudes forward and is located inward with respect to the outer surface 210 so as to form a step in front of the outer surface 210; and

and a front surface part 220 connecting the outer surface part 210 and the protrusion part 230 and facing forward.

With this configuration, heat generated inside the engine cover 100 can be more appropriately discharged. That is, by increasing the surface area of the spacer 200, heat can be appropriately radiated. Further, by forming a step with respect to the outer surface portion 210, the flow of air flowing in the front-rear direction is disturbed inside the hood 100, and the air can be easily guided to the exhaust ports (the upper surface exhaust port 212 and the side surface exhaust port 214) that open outward (in a direction orthogonal to the front-rear direction) in the outer surface portion 210 of the spacer 200.

In addition, the front portion 220 is provided with a hole 223 communicating the space R with the outside of the spacer 200.

With this configuration, heat generated inside the engine cover 100 can be more appropriately discharged. That is, heat can be more appropriately discharged through the hole 223 in addition to the exhaust ports (the upper surface exhaust port 212 and the side surface exhaust port 214).

Further, the hole 223 is formed in an elongated hole shape extending outward from an inner end of the front portion 220.

With this configuration, heat can be discharged more appropriately through the relatively large holes 223.

The tractor 1 of the present embodiment is an embodiment of the work vehicle of the present invention.

The top exhaust port 212 and the side exhaust port 214 in the present embodiment are one embodiment of the exhaust port of the present invention.

The first embodiment of the present invention has been described above, but the present invention is not limited to the above configuration, and various modifications can be made within the scope of the present invention.

For example, the spacer 200 of the tractor 1 is not limited to the structure of the first embodiment described above. Specifically, the spacer 200 may be configured as in the second embodiment of the present invention shown in fig. 11.

The spacer 200 of the second embodiment is different from the first embodiment in that the side vent 214 is not provided in the side surface 213 of the spacer 200. That is, the outer surface portion 210 of the spacer 200 according to the second embodiment is configured to have an exhaust port (upper surface exhaust port 212) only in the upper surface portion 211. The spacer 200 of the second embodiment is substantially the same as the spacer 200 of the first embodiment except for the structure of the side surface portion 213.

As described above, the outer surface portion 210 according to the second embodiment of the present invention has the side surface portions 213 covering both the left and right sides of the space R,

the exhaust port (side exhaust port 214) is not provided in the side surface portion 213.

With this configuration, heat is prevented from being accumulated in the spacer 200, and the appearance in a side view can be improved. That is, by not providing the exhaust port (side exhaust port 214) in the side surface portion 213, the inside of the spacer 200 can be suppressed from being viewed from the side surface.

In the above embodiments, the example in which the hole 223 is provided in the front face 220 of the spacer 200 is shown, but the present invention is not limited to this embodiment, and the hole 223 may not be provided.

In the above embodiments, the front portion 220 and the protrusion 230 are provided in the spacer 200, but the present invention is not limited to this embodiment, and the front portion 220 and the protrusion 230 may not be provided.

The configuration of the exhaust ports (the upper surface exhaust port 212 and the side surface exhaust port 214) is not limited to the embodiments described above, and various embodiments can be adopted. That is, the arrangement and shape of the exhaust ports (the upper surface exhaust port 212 and the side surface exhaust port 214) can be appropriately set from the viewpoint of securing the strength of the spacer 200 and the viewpoint of exhaust efficiency.

The engine cover 100 of the tractor 1 is not limited to the configurations of the above embodiments. Specifically, the structure of the engine cover 100 may be the structure of the third embodiment of the present invention shown in fig. 12.

The engine cover 100 of the third embodiment differs from the first embodiment in that no hole is provided in the bonded portion 142 of the apertured plate portion 140. That is, the perforated plate portion 140 of the third embodiment is configured such that a hole is formed only in the cover portion 141. The perforated plate portion 140 of the third embodiment is substantially the same as the perforated plate portion 140 of the first embodiment, except for the structure of the bonded portion 142.

With this configuration, the perforated plate portion 140 can be bonded to the engine cover 100 more appropriately. That is, by securing the bonding area of the bonded portion 142 to the engine cover 100, the perforated plate portion 140 can be bonded more appropriately.

In each of the above embodiments, the surface roughness (maximum height Rz) of the bonded portion 142 is 100 μm or more, but the present invention is not limited to this, and the surface roughness (maximum height Rz) of the bonded portion 142 may be set to less than 100 μm.

In the above embodiments, the surface roughness of the upper surface of the bonded portion 142 is formed to be thicker than the surface roughness of the upper surface of the cover portion 141, but the present invention is not limited to this embodiment. For example, the surface roughness of the upper surface of the bonded part 142 may be the same as the surface roughness of the upper surface of the cover part 141.

In the above embodiments, the outer surface of cover 141 is formed to be flush with the outer surface of hood 100, but the present invention is not limited to this embodiment. For example, the outer surface of cover 141 may be located above or below the outer surface of hood 100.

In each of the above embodiments, the pair of cover portions 141 are provided for one perforated plate portion 140 so as to correspond to the pair of openings 130, but the present invention is not limited to this embodiment. For example, a pair of perforated plate portions 140 may be provided to the pair of openings 130.

In the above embodiments, the non-adhesive bonding portion 151 is formed in the adhesive bonding layer 150, but the present invention is not limited to this embodiment. For example, the non-adhesive joint 151 may not be formed.

In the above embodiments, the tractor 1 is exemplified as the working vehicle, but the present invention is not limited to such an embodiment. For example, the work vehicle may be another agricultural vehicle, a construction vehicle, an industrial vehicle, or the like.

Claims (8)

1. A work vehicle is characterized by comprising:

an engine cover;

a cabin disposed behind the engine cover; and

a spacer disposed between the engine cover and the cabin,

the spacer is provided with:

an outer surface portion that covers an upper side and both left and right sides of a space behind the engine cover; and

an air outlet provided in the outer surface portion and communicating the space with an outside of the spacer,

the outer surface portion has an upper surface portion covering an upper side of the space,

the exhaust port includes an upper surface exhaust port provided in the upper surface portion,

an opening portion for introducing air into the interior of the engine cover is provided on the upper surface of the engine cover,

the upper surface air outlet is disposed such that a position in a left-right direction of at least a part of the upper surface air outlet coincides with a position in a left-right direction of at least a part of the opening.

2. The work vehicle of claim 1,

the outer surface portion has side surface portions covering both left and right sides of the space,

the exhaust port includes a side exhaust port provided in the side surface portion.

3. The work vehicle of claim 2,

the side exhaust port is disposed such that a vertical position of at least a part of the side exhaust port coincides with a vertical position of at least a part of a muffler body disposed inside the hood.

4. The work vehicle of claim 1,

the outer surface portion has side surface portions covering both left and right sides of the space,

the exhaust port is not provided in the side surface portion.

5. The work vehicle according to any one of claims 1 to 4,

the exhaust port is located rearward of a muffler body disposed inside the hood.

6. The work vehicle according to any one of claims 1 to 4,

the spacer is provided with:

a protrusion that protrudes forward and is located inside the outer surface portion so as to form a step in front of the outer surface portion; and

a front surface portion connecting the outer surface portion and the protrusion portion and facing forward.

7. The work vehicle of claim 6,

the front face is provided with a hole portion that communicates the space with the outside of the spacer.

8. The work vehicle of claim 7,

the hole is formed in an elongated hole shape extending outward from an inner end portion of the front portion.

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