JP2012071795A - Working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working vehicle in which hot air is hardly ejected directly under an engine room, without degrading strength of a mesh body and a porous plate in an engine room forming body, though an exhaust muffler is arranged at an engine on the rear side of the vehicle.SOLUTION: Engine cooling wind is made to flow from vehicle front side to a vehicle rear side in the engine room forming body 20. An exhaust port 50 is formed in a state that a through-hole is provided to a rear wall part 20R constituting the engine room forming body 20, to open in a vehicle rear direction. A wind guide plate 51 is provided from the lower part of the exhaust muffler 3 to the exhaust port 50 so that air inside the engine room forming body 20 can be guided to the exhaust port 50.

Description

  The present invention relates to a work vehicle provided with an engine housed in an engine room forming body at a rear portion of a vehicle body.

  In the work vehicle described above, if the exhaust muffler for the engine is arranged on the rear side of the engine body, the vertical height of the engine room forming body can be reduced as compared with the case where the exhaust muffler is arranged on the upper side of the engine body. In the case of an exhaust muffler using a catalyst, it is advantageous that the length of the exhaust pipe connecting the engine and the exhaust muffler can be shortened so as not to exceed the limit length.

  As this kind of thing, there existed what was described in patent document 1, for example conventionally. The one described in Patent Document 1 includes an upper cover and a lower cover as engine room forming bodies and a muffler as an exhaust muffler.

JP 2008-296780 A

  When the exhaust muffler is arranged on the rear side of the engine body and installed inside the engine room forming body, the air that has risen in temperature due to the heat released by the exhaust muffler in the engine room moves from the engine room to the lower side of the vehicle body along the engine room forming body. It becomes easy to flow out, and it becomes easy to touch the turf with a mower, and it becomes easy to touch a crop with a management machine.

  If the mesh or perforated plate provided to form the exhaust part in the engine room forming body is made larger in size or the hole diameter to make it easier for hot air to flow out from the engine room forming body toward the rear of the vehicle or laterally outward, The strength of the body and perforated plate is likely to decrease.

  An object of the present invention is to provide a work vehicle in which an exhaust muffler is disposed on the rear side of the vehicle body of an engine, and the above trouble can be easily avoided without causing a decrease in strength of a mesh body or a perforated plate. There is.

The first aspect of the present invention is a work vehicle provided with the engine housed in an engine room forming body at the rear of the vehicle body,
An exhaust muffler for the engine is disposed on the vehicle body rear side of the engine and provided inside the engine room forming body,
The engine cooling air is configured to flow from the vehicle body front side to the vehicle body rear side inside the engine room forming body,
An exhaust port formed in a state in which a through-hole is provided in a rear wall portion constituting the engine room forming body and opened rearwardly of the vehicle body, and the air inside the engine room forming body is guided to the exhaust port. A wind guide plate provided below the exhaust muffler and over the exhaust port is provided.

According to the configuration of the first aspect of the present invention, the exhaust muffler is arranged on the rear side of the engine body, and therefore problems such as lowering the height of the engine room forming body and the problem caused by arranging the exhaust muffler above the engine occur. Can be avoided.
Even if the air inside the engine room forming body is heated by the exhaust muffler on the rear side of the engine body and falls while the temperature rises, it is received by the wind guide plate and flows downward from the wind guide plate. Further, the engine cooling air flowing from the front side of the vehicle body to the rear side of the vehicle body flows along the wind guide plate to the exhaust port and flows out from the exhaust port toward the rear side of the vehicle body.

  Therefore, while the height of the engine room forming body is increased due to the exhaust muffler, the air whose temperature has increased due to the exhaust muffler can be removed from the inside of the engine room forming body by the wind guide plate and the exhaust port. It is possible to work while making it difficult to touch hot air to the lawn and crops on the ground.

  In the second aspect of the invention, the wind guide plate is supported in an inclined posture that is located at a lower arrangement height on the side located at the exhaust port.

  According to the configuration of the second aspect of the present invention, the hot air received by the wind guide plate can be smoothly flowed to the exhaust port by the inclination of the wind guide plate, and can hardly stay in the engine room forming body.

  Therefore, since hot air is less likely to stay inside the engine room forming body, it is easier to avoid the downward leakage of hot air, and it is easier to avoid hot air contact with grass and crops.

  According to the third aspect of the present invention, rear weight attaching means is provided for disposing the balance weight below the wind guide plate and attaching it to the rear portion of the vehicle body.

  According to the configuration of the third aspect of the present invention, the balance weight can be compactly attached to the rear portion of the vehicle body by using the space formed below the wind guide plate by the installation of the wind guide plate as the accommodation space for the balance weight.

  Therefore, the vehicle body in which the balance weight is applied to the rear portion of the vehicle body can be obtained in a compact manner.

  According to the fourth aspect of the present invention, device connecting means for detachably connecting the working device is provided at the rear of the vehicle body, and the rear weight mounting means is configured such that the balance weight is detachably connected, and the rear weight Pre-weight attaching means for detachably attaching the balance weight removed from the attaching means to the front portion of the vehicle body is provided.

  According to the configuration of the fourth invention, even when the working device is connected to the rear part of the vehicle body and the weight on the rear side of the vehicle body increases, the balance weight is changed from the rear part of the vehicle body to the front part of the vehicle body, The balance of weight can be advantageously achieved. In other words, if a new balance weight is attached to the front of the vehicle while keeping the balance weight at the rear of the vehicle body, the overall weight will increase due to the balance weight. Therefore, an increase in the overall weight can be avoided. Even if it is necessary to add an auxiliary balance to the front part of the vehicle body, an increase in the overall weight due to the balance weight can be suppressed.

  Therefore, even if the working device is connected to the rear part of the vehicle body, it is possible to work while traveling advantageously while keeping the vehicle body as light as possible and the front and rear weights balanced as much as possible.

  In the fifth aspect of the present invention, the rear weight attaching means is configured to support the balance weight in a state where an upper portion of the balance weight enters below the wind guide plate, and the balance weight is attached to the rear weight attaching means. The vehicle is configured so as to be moved and removed in the longitudinal direction of the vehicle body, and the vehicle body rearward facing surface at the upper part of the balance weight is formed as an inclined surface positioned on the vehicle body front side toward the vehicle body upper side.

  According to the fifth aspect of the present invention, when the balance weight is supported by the rear weight attaching means by increasing the size of the balance weight in the vertical direction of the vehicle body, the upper portion of the balance weight and the wind guide plate are Even when the vehicle is superposed in the longitudinal direction of the vehicle body, the wind guide plate is in contact with the upper part of the balance weight and the balance weight can be removed because the rearwardly facing surface of the upper part of the balance weight is the inclined surface. The balance weight can be removed by moving the balance weight to the rear side of the vehicle body with respect to the rear weight attaching means.

  Therefore, the balance weight is installed using the space below the wind guide plate, but with a large weight in the vertical direction of the vehicle body and a large weight, and exhibits an excellent balance function. can do.

  According to the sixth aspect of the present invention, a flywheel for the engine is disposed below the exhaust muffler and attached to the rear part of the engine so as to be rotatable around a longitudinal axis of a vehicle body, and is supported by a lateral side part of the engine. The wind shield for preventing the wind from the flywheel from hitting the electronic controller is formed of a flat plate facing the vehicle body at the side of the flywheel on the side where the electronic controller is located and covering the upper side of the vehicle body. An upper cover plate, a front cover plate made up of a front and rear body plate covering the front side of the vehicle body at the lateral end portion of the flywheel, and a left and right vehicle body side plate covering the vehicle body laterally outside the flywheel lateral end portion. A horizontal cover plate is provided.

  According to the configuration of the sixth aspect of the invention, it is possible to prevent the high temperature generated by the rotation of the flywheel and the air having a high temperature around the engine from hitting the electronic controller by the wind shield, thereby preventing the temperature of the electronic controller from rising. . The wind shield can be obtained simply by providing the upper cover plate, the front cover plate, and the lateral cover plate.

  Therefore, it is possible to obtain an electronic control device that operates appropriately without being heated easily regardless of the hot air around the engine and the rotation of the flyhole, and can be obtained at low cost by a simple structure wind shield.

  In the seventh aspect of the present invention, a guide plate made of a laterally oriented flat plate is provided on the laterally outer side of the vehicle body of the electronic controller so as to guide the engine cooling air to the electronic controller. Is inclined with respect to the rear side portion of the vehicle body so as to be positioned on the laterally outer side of the vehicle body as the front end side is viewed in the vehicle body vertical direction.

  According to the configuration of the seventh aspect of the invention, the engine cooling air is introduced to the side where the electronic controller is located from a wide range in the lateral direction of the vehicle body by the vehicle body front side portion of the inclined guide plate. Therefore, the engine cooling wind in a state where the wind speed is increased near the position where the wind speed is increased and the cooling action is improved can be caused to act as cooling air on the electronic controller.

  Therefore, an electronic controller that is effectively cooled and operates properly can be obtained at low cost using the engine cooling air.

It is a side view showing the whole riding mower. It is a top view which shows the whole riding mower. It is a left view which shows a drive part. It is a top view which shows a drive part. It is a perspective view which shows a drive part. It is a rear view which shows a drive part. It is a rear view which shows the arrangement | positioning part of a windshield. It is a perspective view which shows a windshield. It is a side view which shows the riding type mower in the state by which the working apparatus was connected with the vehicle body rear part. It is a top view which shows the riding type mower in the state by which the working apparatus was connected with the vehicle body rear part.

Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
[Overall configuration of riding mower]
FIG. 1 shows an overall side surface of a riding mower as an example of a work vehicle according to the present invention, and FIG. 2 shows an overall plane thereof. This riding type mower has a bar blade type mower 4 between front and rear wheels of a body frame 10 of a self-propelled vehicle 1 including a body frame 10 supported by a pair of left and right front wheels 11 and 11 and rear wheels 12 and 12. It is configured as a so-called mid-mount specification that is supported so that it can be raised and lowered.
At the rear of the vehicle body of the self-propelled vehicle 1, a driving unit 2 that houses an engine 21 is provided in an engine room forming body 20, and a driver seat 13 is provided at a front and rear intermediate portion of the self-propelled vehicle body 1.

A gate-shaped overturning protection frame 14 is erected and fixed substantially vertically at the rear of the driver seat 13. The fall protection frame 14 is configured to be foldable rearward around the fulcrum x1 at the upper and lower intermediate portions thereof. When the fall protection frame 14 is folded when mowing around the trunk of the tree, the fall protection frame 14 is formed on the branch from which the fall protection frame 14 protrudes. It is configured so that work can be performed without being caught.
A step 15 located at the foot of the driver seat 13 is mounted and mounted on the front frame portion 10F of the vehicle body frame 10, and fenders 16 are provided on the left and right sides of the driver seat 13.

The pair of left and right front wheels 11 and 11 are configured as caster-type idler wheels, and the pair of left and right rear wheels 12 and 12 are configured as drive wheels capable of continuously variable speed and forward / reverse rotation independently. The left and right rear wheels 12 are driven forward or reverse at a constant speed to travel forward or backward, and the left and right rear wheels 12 are steered and turned in any direction by giving a speed difference. Be able to.
That is, it includes an axial plunger type left and right hydrostatic continuously variable transmission (not shown) driven by the power of the engine 21, and the left and right rear wheels 12 are output by outputs of the left and right hydrostatic continuously variable transmissions. The swash plate angle operation portion of the hydrostatic continuously variable transmission and the shift lever 17 arranged to swing back and forth on the left and right of the driver seat 13 are linked to each other. ing.
Therefore, when the speed change lever 17 is held at the neutral position in the front-rear direction within the operation region, the hydrostatic continuously variable transmission device is in the neutral stop state, and the forward shift can be performed by operating the speed change lever 17 forward from the neutral position. The rear shift can be performed by operating backward.

The mower 4 is suspended from the vehicle body frame 10 by a link mechanism 40 in which a pair of left and right front swing links 40a and 40a and a pair of left and right rear swing links 40b and 40b are connected by an intermediate link 40c.
The link mechanism 40 is provided with a swing arm 42 provided integrally with a support shaft 41 that supports the rear swing link 40b so as to be swingable integrally. By oscillating the oscillating arm 42 in accordance with the expansion / contraction operation of the hydraulic cylinder 43 attached to the vehicle body frame 10, the link mechanism 40 is operated to move the mower 4 up and down. Switching operation can be switched between a descending work state in which 44 is grounded or substantially grounded and a non-raising state in which the gauge wheel 44 is separated from the ground and stored under the belly of the vehicle body frame 10.
The mower 4 is of a side discharge type in which the cut grass cut by the bar blade 45 is discharged from a discharge port 46 located on the right side of the self-propelled vehicle body 1 as shown in FIG. It is configured.

[Composition of the motor section]
As shown in FIGS. 3 to 5, in the prime mover 2, the engine 21, which is a water-cooled gasoline engine in which a radiator 22 is arranged in the engine room forming body 20 on the front side, has an output shaft (not shown). The shaft core P1 is arranged in a vertical posture with the front and rear direction oriented. The engine room forming body 20 is supported by a rear frame 18 erected from the rear frame portion 10R constituting the vehicle body frame 10 and an upper end portion of the rear frame 18 so as to be swingable around a lateral fulcrum x2. And an openable / closable bonnet 20a. The rear frame 18 has a front rear frame 18F in which left and right side plate portions 18A, 18A are connected to the rear frame portion 10R, and a rear bumper whose rear end is detachably connected to the front rear frame 18F. A rear frame 18R is provided. The front end side of the open / close bonnet 20a that covers the engine 21 and the front radiator 22 is supported by a front frame 28 that is erected so as to support the upper portion of the radiator 22 by fixing the lower portions on both sides to the body frame 10. .

  A cooling fan 23 that is rotationally driven by the power from the output shaft of the engine 21 is disposed on the back of the radiator 22. That is, the air outside the engine room forming body 20 is formed in the engine room through the dust-proof net 24 for dust removal provided at the front end of the opening / closing bonnet 20 and provided on the front side of the radiator 22 by the intake and blowing action of the cooling fan 23. The engine 20 is sucked and introduced into the body 20 to generate engine cooling air, and the generated engine cooling air is caused to flow in the engine room forming body 20 from the front side of the vehicle body to the rear side of the vehicle body.

The engine 21 is rubber-mounted on the rear frame portion 10R via vibration-proof rubber (not shown), and is mounted so that vibration on the engine 21 side is not directly transmitted to the vehicle body frame 10 side. ing.
The engine 21 includes a front transmission case 19 and an output shaft (not shown) for transmitting a driving force to the cooling fan 23, and the transmission case 19 has a front mower 4, In addition, the power to the hydrostatic continuously variable transmission of the left and right rear wheels 12 is output.

As shown in FIGS. 3 to 5, an air cleaner 25 that sucks in air after passing through the dust net 24 from the front side of the machine body is disposed on the right side of the engine 21, and purified by the air cleaner 25. An inlet manifold 26 for supplying the air to the engine 21 is attached to the right side portion of the engine 21.
An exhaust manifold 27 is connected to the left lateral side of the engine 21, and the rear end side of the exhaust manifold 27 is flange-connected to the intake port of the exhaust muffler 3 on the rear side of the vehicle body of the engine 21.

As described above, the air cleaner 25 that is a relatively large part is present on the right side of the engine 21 in the open / close bonnet 20a, and the intake hose 25a and the inlet manifold 26 on the intake side with respect to the air cleaner 25 are provided. There are many engine peripherals such as the connecting hose 25b. Compared to this, there is an exhaust manifold 27 on the left side, but the exhaust muffler 3 connected to the exhaust manifold 27 is arranged so as to wrap around the rear side of the engine 21, Except for the exhaust manifold 27, there is no state in which a large engine peripheral device exists.
As a result, an air blowing path R is configured so that the engine cooling air from the radiator 22 side can easily flow on the left side of the engine 21.

The rear frame 18 erected from the rear frame portion 10R of the vehicle body frame 10 is connected and fixed to the rear end sides of the left and right rear frame portions 10R, and also has a function as the vehicle body frame 10. A gate-shaped support frame 29 is erected with the lower ends on both sides fixed to the side plate portion 18A of the front rear frame 18F constituting the rear frame 18.
In this way, the fixed support frame 29 erected from the vehicle body frame 10 side by being fixed to the side plate portion 18A of the front rear frame 18F has a forward arm 29a protruding forward from the support frame 29. The air cleaner 25 is supported in an inclined posture inclined obliquely rearward and downward in a side view in a state of being supported on the forward arm 29a.

  An exhaust muffler 3 for the engine 21 is provided in the engine room forming body 20 on the vehicle body rear side of the engine 21. The exhaust muffler 3 is supported with an installation posture in which the columnar muffler body 30 is positioned at a position lower than the upper end formed by the upper surface of the head cover 21A of the engine 21, and the longitudinal direction of the muffler body 30 is lateral to the vehicle body. Has been.

  The rear wall portion 20R constituting the engine room forming body 20 is configured by a rear vertical plate portion 20A of the opening / closing bonnet 20a and a vertical plate portion 18C of the rear rear frame 18R, and a vertical plate portion of the rear rear frame 18R. An exhaust port 50 formed in a state where a through hole is provided in 18C and opened rearwardly of the vehicle body is provided in the rear wall portion 20R, and a wind guide plate 51 is provided across the exhaust port 50 from below the muffler body 30 of the exhaust muffler 3. It is. The exhaust port 50 is formed in a horizontally long shape over substantially the entire width of the vertical plate portion 18C. The wind guide plate 51 is supported by the vertical plate portion 18 </ b> C in a state where it is positioned over the entire width of the exhaust port 50, and in a downwardly inclined posture that is located at a lower arrangement height on the side positioned at the exhaust port 50. .

  Both lateral ends on the rear end side of the wind guide plate 51 are connected to a bent portion 18b provided on the vertical plate portion 18C near the exhaust port 50 by a connecting bolt 52. The bending angle of the bent portion 18b sets the inclination angle when the wind guide plate 51 is assembled. The front end 51 a of the wind guide plate 51 enters slightly forward from the center 30 a of the muffler body 30 of the exhaust muffler 3. The wind guide plate 51 is provided with notches 51b at both lateral ends on the front end side so that the wind guide plate 51 avoids interference with the projecting pieces 18T protruding inward from the left and right sides of the rear frame 18. The width of the front end side of the plate 51 can be made smaller than the width of the rear end side, and the wind guide plate 51 can be inserted from the rear side of the vehicle body under the exhaust muffler 3 and assembled with the wind guide plate 51 attached to the rear rear frame 18R. It is. The protruding piece 18T of the rear frame 18 is formed by a connecting plate portion provided on each of the front rear frame 18F and the rear rear frame 18R so as to connect the front rear frame 18F and the rear rear frame 18R.

  Air that tends to flow downward between the engine 21 and the rear wall portion 20 </ b> R of the engine room forming body 20 in a state where the temperature has been raised by heating by the exhaust muffler 3 does not flow below the wind guide plate 51. The air is received by the wind guide plate 51, and the inside of the engine room forming body 20 is caused to flow to the exhaust port 50 along the upper surface of the wind guide plate 51 by the engine cooling air flowing from the vehicle body front side to the vehicle body rear side. To the outside of the engine room forming body 20 so as to be discharged toward the rear of the vehicle body.

  As shown in FIGS. 3, 4, and 7, an engine flyhole 56 is disposed below the exhaust muffler 3 at the rear portion of the engine 21 so as to be driven to rotate in the rotational direction F around the vehicle body longitudinal axis 56 a. Is supported. A wind shield 59 is supported on the rear wall of the engine 21 on the rear side of the vehicle body of the electronic controller 57 supported on the rear end side of the right side portion of the engine 21. The electronic controller 57 governs ignition control of the engine 21 and includes three columnar controller bodies.

  FIG. 8 is a perspective view showing the wind shield 59. As shown in FIGS. 4 and 7, the wind shield 59 is disposed on the front side of the lateral end portion 56 a of the flywheel 56 on the side where the electronic controller 57 is located, and is connected to the rear wall of the engine 21 with a connecting bolt. 60, a front cover plate 59F composed of a longitudinally-facing flat plate connected by 60, and a laterally oriented flat plate disposed on the laterally outer side of the lateral end portion 56a of the flywheel 56 and connected to the front cover plate 59F. A horizontal cover plate 59S, and an upper cover plate 59U formed of a vertical plate on the vehicle body that is disposed above the horizontal end portion 56a of the flyhole 56 and is connected to the upper portion of the front cover plate 59F and the horizontal cover plate 59S. It is prepared. The upper cover plate 59U has an inclined posture in which the arrangement height increases toward the rear side of the vehicle body.

  The wind generated by the rotation of the fly hole 56 in the rotation direction F is likely to be scattered toward the right side of the engine 21 at the side end 56a of the fly hole 56 on the side where the electronic controller 57 is located. The wind shield 59 receives and stops the wind generated by the flyhole 56 by the front cover plate 59F, the lateral cover plate 59S and the upper cover plate 59U, and changes the direction to the rear of the vehicle body by the upper cover plate 59U and the lateral cover plate 59S. The wind from the fly hole 56 is prevented from hitting the electronic controller 57.

  As shown in FIGS. 4 and 5, a guide plate 61 made of a laterally oriented flat plate is provided on the laterally outer side of the vehicle body of the electronic controller 57 so as to extend forward from the lateral side plate 18A of the front rear frame 18F. is there. The vehicle body rear side portion 61R of the guide plate 61 facing the vehicle body rear side portion of the electronic controller 57 is positioned substantially parallel to the electronic controller 57 in the vehicle body vertical direction. Of the guide plate 61, the vehicle body front side portion 61F located on the vehicle body front side with respect to the vehicle body rear side portion 61R is positioned on the vehicle body lateral outer side as the front end side is viewed from the vehicle body rear side portion 61R. Inclined.

  In other words, the guide plate 61 allows the electronic controller 57 to move the engine cooling air flowing from the vehicle body front side to the vehicle body rear side on the right side of the engine 21 from a wide range in the vehicle body lateral direction by the vehicle body front side portion 61F in an inclined posture. The engine cooling air in a state where the wind speed is increased near the position where the electronic controller 57 is located and the air speed is increased and the cooling action is improved is caused to act on the electronic controller 57 as cooling air.

[Configuration of exhaust muffler]
As shown in FIGS. 3 to 5, the exhaust muffler 3 includes a muffler body 30 connected to the exhaust side of the exhaust manifold 27 and a side opposite to the side of the muffler body 30 to which the exhaust manifold 27 is connected. And an exhaust pipe 32 projecting upward from the end of the vehicle body. The muffler main body 30 has a natural silencing function, and is configured as a catalyst integrated type configured to incorporate an internal catalyst and perform exhaust treatment.

  An exhaust pipe 31 is connected to the exhaust cylinder 32 of the exhaust muffler 3. The exhaust pipe 31 includes an upstream exhaust pipe portion 33 connected to the exhaust cylinder 32 of the exhaust muffler 3 and a downstream exhaust pipe portion 34 connected to the upstream exhaust pipe portion 33.

  As shown in FIGS. 4 and 5, the upstream exhaust pipe portion 33 is constituted by an elbow pipe bent in an L shape in a rear view. The upstream end portion of the upstream exhaust pipe portion 33 is configured to be elastically fitted to the exhaust tube 32 of the muffler body 30 and attached while adjusting the vertical position, and is fitted to the exhaust tube 32. Then, when the fitting position is determined, it is configured to be connected by being tightened and connected with a metal fastening band (not shown).

  The upper end side of the support stay 36 is connected to the lateral pipe portion on the upper side of the upstream exhaust pipe portion 33 by welding. The lower end side of the support stay 36 is bolted to the mounting bracket 5 fixed to the engine 21 side.

  As shown in FIGS. 4 and 5, the downstream exhaust pipe portion 34 is constituted by an elbow pipe having a diameter larger than that of the downstream end portion of the upstream exhaust pipe portion 33 and bent in an L shape. The upstream end portion is fitted on the downstream end portion of the upstream exhaust pipe portion 33. A downstream end corresponding to a terminal portion of the downstream exhaust pipe portion 34 is provided so as to face an exhaust hole 20B formed in the rear vertical plate portion 20A of the open / close bonnet 20a, and exhaust is exhausted to the outside of the engine room forming body 20. It is configured to discharge.

The downstream exhaust pipe portion 34 is bolted to a mounting bracket 29b fixed to a support frame 29 erected from the vehicle body frame 10 side via a mounting bracket fixed to the outer peripheral side by welding.
As a result, a gap corresponding to a difference in the respective pipe diameters is formed at a fitting position between the downstream side exhaust pipe portion 34 and the upstream side exhaust pipe portion 33, and this gap is caused by the vibration of the engine 21. Even if relative movement in the pipe radial direction occurs at a location, the gap is set to have a dimension that is larger than an interval sufficient to avoid contact between the downstream exhaust pipe portion 34 and the upstream exhaust pipe portion 33. .

  The rear vertical plate portion 20A of the open / close bonnet 20a in which the exhaust holes 20B are formed has a large number of vent holes 20C as a whole including the peripheral portions of the exhaust holes 20B. In the vertical plate portion 18C of the rear rear frame 18R provided with the exhaust port 50, a ventilation window 18a having a porous plate is formed on the upper side of the exhaust port 50 in the vehicle body lateral direction.

  As shown in FIGS. 5 and 8, a fuel supply pump 63 for the engine 21 is disposed on the inner side of the rear frame portion 10 </ b> R of the vehicle body frame 10, on the lateral side of the oil pan portion 21 </ b> B positioned below the engine 21. Arranged and supported. The fuel supply pump 63 is housed in a heat shield case 64 formed in a box shape so as to cover the entire periphery of the fuel supply pump 63, and temperature rise due to exhaust heat of the engine 21 is prevented.

[Balance weight at the rear of the car body]
As shown in FIGS. 3, 5, and 6, a pair of left and right balance weights 70, 70 are provided below the wind guide plate 51 at the rear of the vehicle body of the self-propelled vehicle 1. The pair of left and right balance weights 70 and 70 are intended to balance the front and rear weights of the self-propelled vehicle 1 so that the pair of left and right front wheels 11 and 11 are in contact with each other in a state of receiving a grounding load for accurately performing caster wheel operation. is there.

  The rear weight mounting means 71 provided at the rear part of the vehicle body so as to support the pair of left and right balance weights 70, 70 includes four support shafts 72 that are arranged in the vehicle body lateral direction below the front rear frame 18 F and are arranged in the vehicle body front-rear direction. And a detachable retaining screw 73 attached to the end of each support shaft 72. Each support shaft 72 protrudes from the front rear frame 18F toward the rear of the vehicle body. Of the four support shafts 72, the two support shafts 72, 72 positioned adjacent to the left side of the vehicle body are used for mounting the left balance weight 70, and are positioned adjacent to the right side of the vehicle body 2. The two support shafts 72, 72 are used for mounting the right balance weight 70, and the two support shafts 72, 72 used for mounting the left and right balance weights 70 are hereinafter referred to as a pair of right and left. This will be described as the support shafts 72, 72.

  The rear weight attaching means 71 is provided by moving the balance weight 70 to the front side of the vehicle body with respect to the pair of left and right support shafts 72, 72, and disposed inside the attachment recess 70a on the lower end side of the balance weight 70. A pair of left and right mounting holes 70b, 70b are attached to the pair of left and right support shafts 72, 72, and a retaining screw 73 is attached to the end of each support shaft 72 protruding from the balance weight 70 toward the rear of the vehicle body. Then, the balance weight 70 is attached to the rear part of the vehicle body.

  The pair of left and right support shafts 72, 72 allow the balance weight 70 to be attached and detached by removing the retaining screw 73, and the rear weight connecting means 71 attaches the balance weight 70 so as to be attachable / detachable.

  Each of the pair of left and right balance weights 70, 70 attached to the rear part of the vehicle body has a thickness direction facing the vehicle body front-rear direction, a longitudinal direction facing the vehicle body vertical direction, and an upper part 70 c of the balance weight 70 is below the wind guide plate 51. It enters into a state where it overlaps with the wind guide plate 51 as viewed in the longitudinal direction of the vehicle body.

  A rearward-facing surface 70d of the vehicle body in the upper portion 70c of the balance weight 70 that enters the lower side of the wind guide plate 51 is formed as an inclined surface that is positioned on the front side of the vehicle body toward the upper side of the vehicle body. 72, the upper portion 70c does not come into contact with the wind guide plate 51 until the balance weight 70 is detached from the pair of left and right support shafts 72, 72. The upper part 70 c comes into contact with the wind guide plate 51 by moving further to the rear side of the vehicle body after being detached from the pair of support shafts 72, 72. That is, when the balance weight 70 is in a predetermined attachment state, a gap is formed between the wind guide plate 51 and the rear surface 70d (inclined surface) of the upper portion 70c of the balance weight 70.

  That is, the balance weight 70 attached to the rear portion of the vehicle body by the rear weight attachment means 71 is moved to the vehicle body direction side with respect to the pair of left and right support shafts 72 and 72 with the retaining screw 73 removed. Even if the upper portion 70 c of the weight 70 moves to the rear side of the wind guide plate 51, the upper portion 70 c comes off from the pair of left and right support shafts 72, 72 before contacting the wind guide plate 51, and the pair of left and right support shafts 72. , 72, the entire balance weight 70 is positioned on the lower side of the wind guide plate 51 by the lowering operation, and the balance weight 70 can be taken out to the rear side of the vehicle body through the lower portion of the wind guide plate 51.

[Working equipment]
As shown in FIG. 1, a device connecting means 80 including a pair of left and right connecting bodies 81, 81 provided on the left and right support portions of the fall protection frame 14 is provided at the rear of the vehicle body of the self-propelled vehicle 1.

  The device connecting means 80 includes a pair of left and right connecting hooks 82, 82 provided to the left and right ends of the rear rear frame 18R, in addition to the pair of left and right connecting bodies 81, 81.

  FIG. 9 is a side view showing the riding mower with the working device 90 connected thereto. FIG. 10 is a plan view showing the riding mower with the working device 90 connected thereto. As shown in these drawings, the apparatus connecting means 80 is configured such that the left and right end portions of the front end side of the upper frame 92 constituting the container support frame 91 of the working apparatus 90 are connected to a pair of left and right connecting bodies 81, 81. By connecting the left and right end portions of the lower frame 93 constituting the container support frame 91 to the pair of left and right connecting hooks 82 and 82, the working device 90 is connected to the rear portion of the vehicle body.

  The connecting shaft 83 provided in the left and right connecting bodies 81 is configured to be detachable with respect to the upper frame 92, and the pair of left and right connecting hooks 82 and 82 are engaged with the lower frame 93 so as to be freely engaged and disengaged. The device connecting means 80 is configured to removably connect the working device 90 to the rear portion of the vehicle body.

  The working device 90 includes a container support frame 91 and a grass collection container 95 supported by the container support frame 91 via a rotation support shaft 94 so as to be swingable up and down. The grass collection container 95 is connected to the discharge port 46 of the mower 4 through the transport duct 100 and the transport blower 101, so that the grass cut by the mower 4 is carried into the grass collection container 95. The grass collection container 95 is carried in a downward swinging manner with respect to the container support frame 91 when the rotation support shaft 94 is rotated by an opening / closing lever 96 extending forward from the rotation support shaft 94 toward the vehicle body. It is in a lowered closed state so as to store the cut grass, and is in a lifted open state so as to discharge the stored cut grass by swinging upward with respect to the container support frame 91.

  When the working device 90 is connected, the pair of left and right balance weights 70 are removed from the rear portion of the vehicle body and replaced with the front portion of the vehicle body, even though the weight on the rear side of the vehicle body increases due to the working device 90. The front and rear weights of the self-propelled vehicle 1 are balanced so that the pair of left and right front wheels 11 and 11 are in contact with each other in a state of receiving a contact load for accurately performing caster wheel operation.

[Balance weight at the front of the body]
As shown in FIGS. 2 and 10, the front weight mounting means 105 provided at the front of the vehicle body so as to support the pair of left and right balance weights 70, 70 on the front of the vehicle body is provided on the front side of the vehicle body in step 15 of the driving unit. A lateral support frame 106 disposed between the pair of left and right front wheels 11, four vertical mounting holes 107 provided side by side in the lateral direction of the support frame 106, and four mounting holes 107 is provided with four connecting bolts 108 that are detachably attached to each. Each mounting hole 107 is configured as a screw hole into which the connecting bolt 108 is screwed. The support frame 106 is connected to the front frame portion 10F of the vehicle body frame 10 below the step 15 via a pair of left and right connecting arms 109, 109.

  Of the four mounting holes 107, two mounting holes 107 and 107 positioned adjacent to the left side of the vehicle body are used for mounting the left balance weight 70, and two mounting holes positioned adjacent to the right side of the vehicle body. The holes 107 and 107 are used for mounting the right balance weight 70. Hereinafter, the two mounting holes 107 and 107 used for mounting the left and right balance weights 70 will be referred to as a pair of left and right mounting holes 107 and 107. Will be described.

  The front weight mounting means 105 has the mounting weight 70 in the mounting posture in which the thickness direction of the balance weight 70 is the vertical direction of the vehicle body and the mounting recess 70a is positioned on the rear side of the inclined surface 70d, and the mounting recess 70a of the balance weight 70 is positioned. The part is placed on the upper surface of the support frame 106, and the pair of connecting bolts 108, 108 are mounted over the attachment holes 70 b of the balance weight 70 and the attachment holes 107 of the support frame 106 and tightened to the attachment holes 107 of the support frame 106. As a result, the balance weight 70 is attached to the front of the vehicle body.

  The pair of connecting bolts 108 and 108 are detachable with respect to the balance weight 70 and the support frame 106, and the front weight attaching means 105 detachably attaches the balance weight 70 to the front portion of the vehicle body.

  In the pair of balance weights 70, 70 attached to the front part of the vehicle body, the thickness direction is the vertical direction of the vehicle body, and the vertical direction of the vehicle body when attached to the rear part of the vehicle body is the longitudinal direction of the vehicle body. It becomes a posture, does not protrude upward from step 15, and the minimum ground height of the balance weight 70 is high. In the pair of balance weights 70, 70 attached to the front part of the vehicle body, the inclined surface 70d that faces the rear of the vehicle body in the state of being attached to the rear part of the vehicle body has an attachment posture in which the vehicle body faces upward.

[Another Example]

(1) In the above-described embodiment, the example in which the wind guide plate 51 is inclined downwardly is shown.

(2) In the above-described embodiment, the exhaust muffler 3 is shown in an attachment posture in which the longitudinal direction of the muffler main body 30 is lateral to the vehicle body. However, the longitudinal direction of the muffler main body 30 is vertical to the vehicle body and front and rear to the vehicle body. You may be in the mounting posture.

(3) In the above-described embodiment, the example in which the electronic controller 57 is supported on the right side portion of the engine 21 is shown, but the electronic controller 57 may be supported on the left side portion of the engine 21.

(4) In the above-described embodiment, the embodiment is shown in which the pair of balance weights 70 and 70 are adopted so that the balance weight 70 can be easily carried from the weight side, but three pieces are provided so that the balance weight 70 can be carried more easily. You may employ | adopt the above balance weight. One balance weight may be used.

(5) In the above-described embodiment, an example in which the exhaust muffler 3 using a catalyst is employed has been described. However, an exhaust muffler that does not utilize a catalyst may be employed.

(6) In the above-described embodiment, an example in which only the balance weight 70 removed from the rear part of the vehicle body is attached to the front part of the vehicle body is shown, but depending on the configuration of the working device connected to the rear part of the vehicle body and the self-propelled vehicle 1 You may comprise so that the auxiliary | assistant balance weight may be attached to a part. As an auxiliary balance weight to be attached to the front part of the vehicle body, when the balance weight 70 is changed from the rear part of the vehicle body to the front part of the vehicle body, one that is configured to be detachable so as to be attached to the front part of the vehicle body, or one that is permanently installed at the front part of the vehicle body is adopted. May be.

  The work vehicle of the present invention is not limited to a riding-type mower as shown in the embodiment, but for example, a mobile farm machine such as a tractor, a combiner, or a rice transplanter, and various work vehicles such as a construction machine and a transport vehicle. Can be applied.

3 Exhaust Muffler 20 Engine Room Forming Body 20R Rear Wall 21 Engine 50 Exhaust Port 51 Wind Guide Plate 56 Flywheel 56b Horizontal End of Flywheel 57 Electronic Controller 59 Windshield 59F Front Cover Plate 59S Horizontal Cover Plate 59U Upper Cover Plate 61 Guide plate 61F Vehicle body front side portion of guide plate 61R Vehicle body rear side portion of guide plate 70 Balance weight 70c Upper portion of balance weight 70d Inclined surface of balance weight 71 Rear weight attachment means 80 Device connection means 105 Front weight attachment means

Claims (7)

A work vehicle provided with the engine housed in an engine room forming body at the rear of the vehicle body,
An exhaust muffler for the engine is disposed on the vehicle body rear side of the engine and provided inside the engine room forming body,
The engine cooling air is configured to flow from the vehicle body front side to the vehicle body rear side inside the engine room forming body,
An exhaust port formed in a state in which a through-hole is provided in a rear wall portion constituting the engine room forming body and opened rearwardly of the vehicle body, and the air inside the engine room forming body is guided to the exhaust port. A work vehicle comprising a wind guide plate provided below an exhaust muffler and over the exhaust port.   The work vehicle according to claim 1, wherein the wind guide plate is supported in an inclined posture positioned at a lower arrangement height toward a side positioned at the exhaust port.   The work vehicle according to claim 1 or 2, further comprising rear weight attaching means for arranging a balance weight below the wind guide plate and attaching the balance weight to a rear portion of the vehicle body. A device connecting means for detachably connecting the working device to the rear of the vehicle body is provided,
The rear weight attaching means is configured such that the balance weight is detachably connected,
4. The work vehicle according to claim 3, further comprising front weight attaching means for detachably attaching the balance weight removed from the rear weight attaching means to a front portion of a vehicle body. The rear weight attachment means is moved in the longitudinal direction of the vehicle body with respect to the rear weight attachment means so that the balance weight is supported with the upper portion of the balance weight entering the lower part of the wind guide plate. Configured to be operated and desorbed,
5. The work vehicle according to claim 3, wherein an upper surface of the balance weight facing the rear of the vehicle body is formed as an inclined surface positioned on the front side of the vehicle body toward the upper side of the vehicle body. A flywheel for the engine is arranged below the exhaust muffler and attached to the rear part of the engine so as to be rotatable around a vehicle body longitudinal axis.
A windshield for preventing wind from the flywheel from hitting an electronic controller supported on a lateral side of the engine, and a vehicle body upper side of a lateral end of the flywheel on the side where the electronic controller is located An upper cover plate made of a flat plate facing the vehicle body, a front cover plate made of a flat plate facing the vehicle body covering the front side of the vehicle body at the lateral end of the flywheel, and a vehicle body lateral outer side of the lateral end portion of the flywheel The work vehicle according to any one of claims 1 to 5, further comprising a lateral cover plate made of a flat plate facing the vehicle body in the left-right direction. Provided with a guide plate made of a laterally oriented flat plate located on the lateral side of the vehicle body of the electronic controller so as to guide the engine cooling air to the electronic controller,
The work vehicle according to claim 6, wherein the vehicle body front side portion of the guide plate is inclined so that the front end side of the guide plate is positioned on the vehicle body lateral outer side as viewed from the vehicle body vertical direction.

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