JPH10244843A - Engine cooling structure for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool an engine without a hitch by preventing bad suction even if dust is stuck to a dust removing implement of an intake part. SOLUTION: An engine bonnet 3 has an intake 13 with a dust preventing member at a rear part 3a. A cooling passage R from the intake part 13 to a rotating fan 11 is provided with a cooling air introducing member 15 in which an opening 19 with a dust removing implement is fitted and the cooling air introducing member 15 has an intake part 17 opening downward to the outside of the bonnet 3 at the bottom end thereof. The rotating fan 11 applies a strong suction force to the opening 19 and a weak suction force to the intake part 13 to suck cooling air from the intake part 13 and the cooling air introducing member 15, supplying it to a radiator 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cooling structure for a working vehicle in which a radiator for cooling an engine and a rotary fan for sucking and supplying cooling air to the radiator are arranged inside an engine hood.

[0002]

2. Description of the Related Art In the above-mentioned work vehicle, an intake port is conventionally provided in an engine hood, and a rotating fan sucks cooling air into the engine hood only through the hood intake port.

[0003]

In the above-described cooling structure, dust may adhere to the dust remover due to the action of the suction force generated at the intake port due to the rotating fan. For this reason, conventionally, when performing work that tends to generate dust such as cutting turf, dust adheres to the dust removal tool provided in the bonnet intake almost all around the same time, and engine cooling failure due to poor intake occurs relatively early. There was something to do. An object of the present invention is to provide an engine cooling structure in which poor engine cooling does not easily occur even when dust adheres to a dust remover.

[0004]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[Configuration] A radiator for cooling an engine,
In the engine cooling structure of a work vehicle, wherein a rotating fan that sucks and supplies a cooling air to the radiator is provided inside the engine hood, an intake port with a dust removal tool for sucking the cooling air into the rotating fan is provided in the engine bonnet. The cooling air introduction body having an opening on the side and an intake port on the lower end side respectively enters the cooling air path from the intake port with the dust removal tool to the rotating fan in the engine hood, and the intake port faces downward on the vehicle body. The cooling fan is configured to be opened toward the outside of the engine hood, and the rotating fan is configured to suck cooling air through the cooling air introducing body. The cooling air introducing member is provided with a dust removing device acting on the cooling air sucked into the cooling air.

[Operation] Since the opening on the upper end side of the cooling air introduction body enters the cooling air passage from the intake port of the engine hood with the dust remover to the fan, the opening of the cooling air introduction body extends from the intake port of the hood. Also, the cooling air introducing body is located close to the fan, and the cooling air introduction body becomes an obstacle to reduce the suction action of the fan to the hood intake, thereby reducing the suction force generated at the hood intake. This allows the rotating fan to suction the opening of the cooling air introduction body and the intake port of the engine bonnet in a state where the rotating fan generates a stronger suction force at the opening of the cooling air introduction body than the intake port of the engine bonnet. The cooling air is sucked and supplied to the radiator. Therefore, even when dust is generated, such as when mowing grass, dust is less likely to adhere to the dust remover provided in the hood inlet than to the dust remover provided in the cooling air introducing body.
As a result, even if a large amount of dust adheres to the dust remover of the cooling air introduction body and the cooling air is not smoothly sucked from the cooling air introduction body, even if a situation occurs in which the cooling air is not smoothly sucked from the cooling air introduction body, the dust removal implement at the hood intake port has the cooling air introduction body side. The cooling air is smoothly sucked from the hood intake port so that the engine can be cooled without any trouble until the dust remover at the hood intake port becomes clogged due to dust adhesion.

[Effect] Even when dust is generated and easily adheres to the dust remover, the dust remover of the cooling air introduction body and the dust remover of the bonnet are unlikely to be clogged at the same time, and the dust remover can be used. Even if dust adheres, engine cooling failure does not occur directly, and work can be performed efficiently without the need to interrupt the work for cleaning the adhered dust, or even if the number is small, if necessary.

The structure, operation and effect of the invention according to claim 2 are as follows.

[Constitution] In the constitution according to the first aspect of the present invention, the dust remover provided in the cooling air introducing body is disposed in the opening, and the back side is inclined so as to face the intake port.

[Operation] Even if dust adheres to the dust remover, when the rotating fan is stopped, the suction action of the fan is released, so that the dust naturally comes off the dust remover and falls from the intake port.

[Effect] By simply stopping the fan, the dust remover can be cleaned and the cooling air can be smoothly sucked.

The structure, operation and effect of the invention according to claim 3 are as follows.

[Structure] In the structure according to the first or second aspect of the present invention, a strut support portion is provided on the upper end side of the cooling air introducing body for erecting a steering handle strut.

[Operation] A steering handle column is provided upright on the upper end side of the cooling air introducing body and a steering handle is provided. That is, the steering handle is disposed at a desired arrangement level while the steering handle support is shortened as compared with the case where the steering handle support is directly erected on the vehicle body.

[Effect] A relatively light and small mounting structure using a short post as the steering handle post is advantageous in that the steering handle can be arranged at a predetermined level.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a driving unit which is self-propelled by a pair of left and right front wheels 1 and 1 and driven rear wheels 2 and 2 and has an engine E, an engine bonet 3 and the like is mounted on the front of the vehicle body. A lawn mowing device 30 is provided between the front and rear wheels of a self-propelled vehicle body having a driving unit having a steering handle 4 and a driver seat 5 for steering the front wheels 1 on the rear side of the vehicle body. The motor is connected so as to be able to move up and down freely, and power is transmitted from the output device 8 of the self-propelled body to the lawnmower 30 via the transmission belt 9, thereby constituting a riding lawn mower.

As shown in FIG. 1, the engine bonnet 3
Is a rear bonnet portion 3a which is also used as a control tower having an operation panel at the upper end and is fixed to the self-propelled body.
A front bonnet portion 3b fixed to the self-propelled body while covering both lateral sides of the engine E on the vehicle body front side with respect to the rear bonnet portion 3a; And an upper bonnet portion 3c that can be opened and closed by swinging up and down around a lateral axis of the vehicle body located on the side.

As shown in FIGS. 1 and 2, a radiator 10 for cooling the engine and a rotating fan 11 are provided on the rear side of the engine E inside the engine bonnet 3, and at the rear end of the rear bonnet portion 3a, A first air inlet 13 having a net dust remover 12 for opening the rearward of the vehicle body and removing dust such as cutting turf from the engine cooling wind sucked into the bonnet is provided, and an upper end of the rear bonnet portion 3a is provided. A second air inlet 14 is provided on both lateral sides, and a cooling air introducing body 15 having an upper end portion 15a entering a cooling air passage R through which engine cooling air flows from the first air inlet 13 to the rotary fan 11 is provided at a rear portion. The hood 3 is provided between the radiator 10 and a rear vertical wall portion having the first air inlet 13 of the bonnet portion 3a. As clearly shown in FIGS. 3 and 4, the cooling air introducing body 15 includes a box-shaped lower end side introducing body portion 15 b made of a sheet metal and attached over the upper surfaces of a pair of right and left body frames 16, 16 of the self-propelled body. The lower end side introduction part 15b is formed by the sheet-shaped box-shaped upper end side introduction part 15a which stands upright at the rear part on the upper surface side. At the lower end side of the cooling air introduction body 15, an intake port 1 opening downward to the outside of the engine hood 3 toward the vehicle body
7 is formed by a downward opening of the lower-side introduction body portion 15b, and dust such as cutting turf is formed on the upper end side of the cooling-air introduction body 15 from the engine cooling wind that is opened forward toward the rotary fan 11 and is sucked. A first opening 19 having a net dust remover 18 to be removed is formed by a forward opening of the upper end introduction part 15a, and opens upward in the vehicle body at a position closer to the rotating fan 11 than the upper end introduction part 15a. A dust remover 20 made of a mesh for removing dust such as cutting turf from the engine cooling wind sucked together
The opening 21 is formed by an opening positioned on the upper surface of the lower end side introduction body portion 15b, and an engine cooling structure is configured such that cooling air is supplied to the radiator 10 by the rotating fan 11 to cool the engine cooling water. is there.

That is, when the engine E is driven, the rotary fan 11 is driven by the output pulley 22 of the engine E via the transmission belt 23 to suction the first intake port 13 and the second intake port 14 of the engine hood 3. The cooling air is sucked into the engine bonnet from both intake ports 13 and 14 and is supplied to the radiator 10 through the cooling air passage R. At the same time, the first opening 19 and the second opening 21 of the cooling air introducing body 15 are also suctioned, and both the openings 19,
Cooling air is sucked into the engine hood via the air intake 21 and the intake port 17 and is supplied to the radiator 10.

Then, the second opening 21 of the cooling air introducing body 15 is formed.
Is closer to the fan 11 than the first opening 19, the suction force generated in the second opening 21 is stronger than the suction force generated in the first opening 19. As a result, even if a large amount of dust such as cut turf adheres to the dust remover 20 of the second opening 21 of the cooling air introduction body 15 and the cooling air is not smoothly sucked in from the second opening 21, the first opening 21 is opened. Cooling air is supplied to the radiator 10 in a state where the dust is not attached to the dust removing device 18 as much as the second opening 21 and the cooling air is smoothly sucked in from the first opening 19. In addition, cooling air introducing body 1
5 has the first opening 19, the upper end side introduction body portion 15 a enters the cooling air passage R, and the first intake port 13 by the fan 11.
That it is an obstacle that reduces the suction effect on
Since the first opening 19 of the cooling air introducing body 15 is closer to the fan 11 than the first intake port 13, the suction force generated at the first opening 19 becomes stronger than the suction force generated at the first intake port 13. . As a result, even if a large amount of dust adheres to the dust remover 18 of the second opening 19 and the cooling air is not smoothly sucked from the second opening 19, the dust remover of the first intake port 13 of the rear bonnet portion 3a. The dust is not attached to the radiator 12 as much as the first opening 19, and the cooling air is supplied to the radiator 10 in a state where the cooling air is smoothly sucked from the first air inlet 13.

As is clearly shown in FIG.
The dust remover 18 of the first opening 19 has a rearwardly inclined position located closer to the rear of the vehicle body toward the upper end so that the back side of the dust remover 18 is inclined toward the intake port 17.
a. As a result, when the engine E is stopped, the rotating fan 11 stops and the suction action on the first opening 19 is released, so that the dust adhering to the dust remover 18 is removed from the dust remover 18 by itself and the intake port. 17
From above to the ground, and the dust remover 18 can be cleaned. Since the dust remover 20 in the second opening 21 is in a horizontal posture above the intake port 17, the dust remover 20 can be cleaned similarly.

As is clearly shown in FIG.
A part of the upper surface side of the upper end side introduction body portion 15a is formed in a column support portion 24, a steering handle column 25 is erected on the column support portion 24, and the handle column 25 and the cooling air introduction member 15 are rotated. The steering handle 4 is supported via a handle shaft that can be freely inserted.
Also, a lower end side introduction body portion 15b of the cooling wind introduction body 15 is formed on a battery mounting portion at a lateral end on the upper surface side, and a battery 26 is mounted using the lower introduction body portion 15b as a battery mounting base. is there.

As shown in FIG. 1, a roller 32 for moving over an obstacle on the ground is attached to both sides of a rear portion of a cutting blade housing 31 of a lawn mower 30. The roller 32 is mounted by a mounting structure shown in FIGS.

That is, the upper end of the support rod 33 to which the roller 32 is rotatably connected to the lower end is supported by a bracket 34 which is supported by a support arm extending from the cutting blade housing 31.
And a pair of upper and lower locking portions of a spring plate lock device 35 held by the bracket 34 are engaged with the recessed portions of the support rod 33, and this engaged state is locked by the lock cam 36. The support rod 33 is fixed to the bracket 34 so as not to come off by being maintained by the pressing action on the tool 35. The lock cam 36
Is rotated to an unlock position by an operation lever 37 extending therefrom to release the pressing of the lock member 35 against the support rod 33, thereby locking the lock member 35 by the cam action of the recessed portion of the support rod 33. The support rod 33 can be slid up and down with respect to the bracket 34 while pushing the part out of the recessed part of the support rod 33. The mounting height of the support rod 33 with respect to the bracket 34 is changed to change the cutting blade housing 31 of the roller 32. It is designed to be able to change the mounting height with respect to. In the case of this mounting structure, the lock 35
Presses and fixes the support rod 33 against the bracket 34, so that the support rod 33 is supported so as to be less likely to rattle.

The present invention is applicable not only to lawn mowers but also to various vehicles such as agricultural tractors and combine harvesters. Therefore, these vehicles are collectively referred to as work vehicles.

[Brief description of the drawings]

FIG. 1 is a side view of an entire riding lawn mower.

FIG. 2 is a cross-sectional view of a part of a driving unit.

FIG. 3 is a perspective view of a cooling air introduction body.

FIG. 4 is a cross-sectional view of an arrangement portion of a cooling air introduction body.

FIG. 5 is a longitudinal sectional view of a roller mounting structure.

FIG. 6 is a cross-sectional view of a roller mounting structure.

[Explanation of symbols]

 Reference Signs List 3 engine bonnet 10 radiator 11 rotating fan 13 intake port with dust remover 15 cooling air introduction body 17 intake port 18 dust remover 19 opening 24 support column 25 steering handle column

 ──────────────────────────────────────────────────の Continuing on the front page (72) Katsuhiko Uemura, Inventor 64, Ishizukita-cho, Sakai City, Osaka Inside the Kubota Sakai Plant (72) Inventor Hiroshi Oshima 64, Ishizukita-cho, Sakai City, Osaka Prefecture In-house (72) Inventor Masatoshi Yamaguchi 64 Ishizu-Kitacho, Sakai City, Osaka Prefecture Inside Kubota Sakai Works, Ltd. (72) Inventor Masaki Hayashi 64 in Ishizu-Kitamachi, Sakai City, Osaka Prefecture, Kubota Sakai Works, Ltd.

Claims (3)

[Claims] An engine cooling structure for a working vehicle, wherein a radiator for cooling an engine and a rotary fan for sucking and supplying cooling air to the radiator are arranged inside an engine hood. The engine bonnet is provided with an intake port with a dust removal tool to be sucked, and a cooling air introducing body having an opening at an upper end side and an intake port at a lower end side is provided. Into the cooling air path to the outside, the air intake port is provided so as to open downward to the outside of the engine hood, and the rotating fan is configured to suck cooling air through the cooling air introduction body. A cooling fan is provided on the cooling air introducing body, the dust removing tool acting on cooling air sucked into the engine hood through the cooling air introducing body by the rotating fan. Engine cooling structure for a working vehicle. 2. The engine cooling structure for a working vehicle according to claim 1, wherein the dust removal tool provided in the cooling air introducing body is disposed in the opening, and a rear surface of the cooling air introducing body is inclined so as to face the intake port. 3. The engine cooling structure for a working vehicle according to claim 1, further comprising a column support portion on an upper end side of the cooling air introducing body, the column supporting portion erecting a steering handle column.