JP2004255984A - Tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tractor for surely cooling an oil pan. <P>SOLUTION: In this tractor, an oil pan is arranged between a pair of left and right front and rear extending frame forming bodies extending in a front and rear direction to form a part of a machine body frame, and an oil pan protective body is mounted between both the front and rear extending frame forming bodies. A lower side and left and right sides of the oil pan are covered with the oil pan protective body. A cooling air flow passage is formed between an upper surface of the oil pan protective body and a lower surface of the oil pan. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tractor.
[0002]
[Prior art]
Conventionally, as one form of a tractor, a radiator, an engine, and a front-blowing-type cooling fan are arranged in this order from the rear to the front in the prime mover section, and an inner cover that covers the left, right, left and right sides of the engine is provided. There is one in which an internal space of an inner cover serves as a passage for cooling air generated by a cooling fan (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-5-42830
[Problems to be solved by the invention]
However, in the tractor described above, there is a problem that the oil pan provided in the lower part of the engine is not sufficiently cooled.
[0005]
For this reason, it is difficult to secure a required appropriate temperature between the oil temperature of the working oil in the oil pan and the ambient temperature of the engine.
[0006]
Moreover, since the oil pan is open and exposed below the body frame, there is a risk that the oil pan may be damaged by stones or the like scattered while the body is running.
[0007]
[Means for Solving the Problems]
Therefore, in the present invention, the engine is mounted on the body frame, a cooling fan is provided at the front of the engine, and cooling air sent from the cooling fan is guided to an oil pan provided at the lower part of the engine. In the tractor, the oil pan is arranged between a pair of right and left front and rear extension frames forming a part of the body frame by extending in the front and rear direction, and an oil pan protector is installed between the two front and rear extension frames. The tractor is characterized in that the oil pan protector covers the lower side and the left and right sides of the oil pan and a cooling air flow path is formed between the upper surface of the oil pan protector and the lower surface of the oil pan. To provide.
[0008]
In addition, the present invention provides an oil pan having a recess at a front portion and a step between a front bottom surface and a rear bottom surface to provide a wide vertical space between the front bottom surface and the oil pan protector. In addition to the formation of the side cooling flow path, the outflow side cooling flow path having a narrow upper and lower width is formed between the rear bottom surface and the oil pan protector.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0010]
That is, the tractor according to the present invention has, as a basic structure, an engine mounted on an airframe, a cooling fan provided at a front portion of the engine, and a cooling air blown from the cooling fan provided at a lower portion of the engine. I'm trying to lead to an oil pan.
[0011]
As a characteristic structure, the oil pan is arranged between a pair of left and right front and rear extension frame forming bodies extending in the front and rear direction to form a part of the body frame, while the oil pan is disposed between the front and rear extension frame forming bodies. A protection body is provided to cover the lower side and the left and right sides of the oil pan with the oil pan protection body, and a cooling air flow path is formed between the upper surface of the oil pan protection body and the lower surface of the oil pan.
[0012]
In addition, the oil pan has a recess at the front, and a step is provided between the front bottom and the rear bottom, so that a vertically wide inlet-side cooling passage is provided between the front bottom and the oil pan protector. And an outlet-side cooling flow path having a narrow upper and lower width is formed between the rear bottom surface and the oil pan protector.
[0013]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 shows a front part of a tractor A according to the present invention. The tractor A is provided with a motor unit 2 at a front part on an airframe 1 and a driving unit 3 at a rear position of the motor unit 2. A front wheel 5 is provided below the body frame 1 via a front axle case 4. Reference numeral 6 denotes a transmission shaft interposed between a transmission unit (not shown) and the front axle case 4, and reference numeral 16 denotes a hood covering the motor unit 2.
[0015]
As shown in FIGS. 1 and 2, the body frame 1 includes a pair of left and right front and rear extension frames 1 a and 1 a extending in the front and rear direction, and a left and right extension frame provided between the front ends of the frame formation bodies 1 a and 1 a. And formed body 1b.
[0016]
As shown in FIGS. 1 and 2, the motor unit 2 has an engine E mounted between the front portions of a pair of left and right front and rear extension frame forming bodies 1a, 1a. The shaft 7 protrudes, a cooling fan 8 is attached to the cooling fan support shaft 7, and a radiator 9 is arranged in front of the cooling fan 8. Reference numeral 10 denotes a cooling fan drive mechanism.
[0017]
An oil pan 11 is provided below the engine E, and the oil pan 11 is disposed between a pair of left and right front and rear extension frame forming bodies 1a, 1a.
[0018]
An oil pan protector 12 is provided between the pair of left and right front and rear extension frame forming bodies 1a, 1a. The oil pan protector 12 includes a lower protector 12a formed in a square plate shape and a lower protector 12a. The protection body 12a is formed in a gutter shape from the left and right side protection bodies 12b, 12b formed by being raised from the left and right side edges.
[0019]
In addition, the left and right side protectors 12b, 12b of the oil pan protector 12 are attached to the front and rear extension frame forming bodies 1a, 1a via attachments 13, 13, respectively. A cooling air flow path 14 is formed between the upper surface of the oil pan protector 12 and the lower surface of the oil pan 11 while covering the lower and left and right sides.
[0020]
Moreover, the oil pan 11 has a recess 15 at the front and a step between the front bottom 11a and the rear bottom 11b to allow the front bottom 11a and the front of the oil pan protector 12 to be in contact with each other. A vertically wide inlet-side cooling flow path 14 a is formed therebetween, and a vertically narrow narrow outflow-side cooling flow path 14 b is formed between the rear bottom surface and the rear part of the oil pan protector 12.
[0021]
In this manner, since the oil pan protector 12 covers the lower side and the left and right sides of the oil pan 11, even if a stone or the like scatters on the oil pan 11 side while the body is running, the oil pan protection can be achieved. The oil pan 11 can be protected by the body 12, and damage to the oil pan 11 can be reliably prevented.
[0022]
Moreover, since the cooling air flow path 14 is formed between the upper surface of the oil pan protector 12 and the lower surface of the oil pan 11, the cooling air a sent from the cooling fan 8 provided at the front of the engine E is The oil pan 11 can be reliably cooled by the cooling wind a rectified through the cooling air flow path 14 and smoothly guided to the rear through the cooling air flow path 14.
[0023]
As a result, the oil temperature of the working oil in the oil pan 11 and the ambient temperature of the engine E can be maintained at required appropriate temperatures.
[0024]
At this time, since the introduction side cooling flow path 14a is formed to be wide vertically, the introduction and intake of the cooling air a can be made smooth and reliable, and the outflow side cooling flow path 14b is formed vertically narrow. As a result, the flow velocity of the cooling air a smoothly and reliably introduced and taken in can be increased in the outflow-side cooling passage 14b, and the cooling efficiency of the oil pan 11 and the engine E can be increased. .
[0025]
As shown in FIG. 1, a flywheel unit 20 and a clutch unit 21 are interlockedly connected to a rear portion of the engine E, and the clutch unit 21 includes a dry clutch.
[0026]
Here, since the cooling air a rectified by the oil pan protector 12 can flow out to the clutch part 21 side as described above, the dry clutch and the clutch cover of the clutch part 21 can be efficiently cooled at the same time. Can be.
[0027]
3 and 4 show another embodiment of the cooling structure of the oil pan 11 described above. The cooling structure of the oil pan 11 according to the present embodiment has the same basic structure as the cooling structure described above. However, the difference is that a cooling air guide 22 is provided in place of the oil pan protector 12.
[0028]
That is, the cooling air guide body 22 is provided between the pair of left and right front and rear extension frame forming bodies 1a, 1a, and has the same shape as the lower guide body 22a formed in the shape of a rectangular plate whose left and right widths are wider than the oil pan 11. The lower guide 22a is formed in a gutter shape from the left and right side guides 22b, 22b which are formed to rise from the left and right side edges.
[0029]
The left and right side guides 22b, 22b of the cooling air guide 22 are attached to the front and rear extension frame forming bodies 1a, 1a via attachments 23, 23, respectively.
[0030]
In addition, the cooling air guide 22 has the starting end 22c located immediately behind the radiator 9 and immediately below the cooling fan, and the midway portion 22d located immediately below the front of the engine E. The end portion 22 e is disposed immediately below the front bottom surface 11 a of the oil pan 11, and a cooling air guide passage 24 is formed in the cooling air guide body 22.
[0031]
In this way, the portion of the cooling air guide flow path 24 extending from the start end 22c to the intermediate part 22d is formed as a downwardly inclined downward flow path, and the cooling air guide flow path 24 extending from the intermediate part 22d to the end part 22e. Is a substantially horizontal flow path directed toward the rear oil pan 11.
[0032]
Therefore, the cooling air “a” sent from the cooling fan 8 is surely guided toward the oil pan 11 through the cooling air guide channel 24 formed in the cooling air guide 22 and cools the oil pan 11. Can be.
[0033]
As a result, the oil temperature of the working oil in the oil pan 11 and the ambient temperature of the engine E can be maintained at required appropriate temperatures.
[0034]
Also in the case of the present embodiment, the cooling air a rectified by the cooling air guide 22 can flow out to the clutch portion 21 side, so that the dry clutch and the clutch cover of the clutch portion 21 can be efficiently cooled at the same time. It can be carried out.
[0035]
5 and 6 show a motor unit 2 as another embodiment. The motor unit 2 has the same basic structure as that of the above-described motor unit 2, but has a flywheel 25 at the rear of the engine E. The upper half of the flywheel 25 is covered with a flywheel upper cover body 26, and the lower part of the flywheel 25 is located between the lower ends of a pair of left and right front-rear extension frames 1a, 1a. The difference is that the flywheel lower cover body 27 is integrally laid horizontally and the flywheel lower cover body 27 covers the lower part of the flywheel 25.
[0036]
In this manner, since the lower portion of the flywheel 25 is covered with the flywheel lower cover body 27, it is possible to prevent an operator from accidentally touching the flywheel 25 from below, thereby improving safety. be able to.
[0037]
In addition, since the lower flywheel cover body 27 is integrally laid between the lower ends of the front and rear extension frame forming bodies 1a, 1a, the rigidity of the body frame 1 can be increased.
[0038]
FIG. 7 shows another embodiment of the radiator 9. The radiator 9 has a shroud 31 connected to the back of a radiator main body 30. The shroud 31 has a shroud main body 31a formed of a synthetic resin in a hollow ring shape. To form a cylindrical intake guide wall 31b at the center, and gradually from the peripheral edge 31c of the intake guide wall 31b on the radiator 9 side to the peripheral edge 31d of the intake fan (not shown). The inner diameter is reduced.
[0039]
In this way, the intake air from the intake fan flows smoothly through the intake guide wall 31b.
[0040]
In addition, a plurality of (four in this embodiment) partition walls 31e are provided in the shroud main body 31a, divided into four rooms, and the upper left room 31f among them is a sub-tank.
[0041]
Then, the base end 33a of the communication pipe 33 is connected to the cooling liquid injection part 32 provided on the upper part of the radiator body 30, and the middle part 33b of the communication pipe 33 is connected to the pressure release valve 34. The distal end 33c of 33 is disposed in a room 31f as a sub-tank formed in the shroud main body 31a.
[0042]
In this way, when the coolant in the radiator body 30 is heated and expanded, it flows through the communication pipe 33 to the pressurizing and releasing valve 34 and pressurizes the pressurizing and releasing valve 34 so that the pressurizing and releasing valve 34 Is opened, and flows into the room 31f as a sub-tank from the middle part 33b of the communication pipe 33 via the tip part 33c.
[0043]
Further, in the radiator 9 according to the present embodiment, the shroud 31 can be formed in a shape that can effectively use the dead space around the radiator main body 30, so that the radiator 9 can be compactly configured, Since the radiator body 30 and the shroud 31 are integrated, the number of components can be reduced, and the radiator 9 can be easily arranged.
[0044]
FIG. 8 shows the structure of a cooler section 40 disposed on the front side of the radiator 9. The cooler section 40 is provided on the radiator 9 via a support 41 with an oil cooler pipe 42 and a fuel cooler pipe 43. Are compactly constructed by being installed in the upper and lower positions.
[0045]
In this way, the heated hydraulic oil sent from the transmission unit (not shown) flows in from the start end 42a of the oil cooler pipe 42, and the hydraulic oil flows in the oil cooler pipe 42. After cooling, the cooled hydraulic oil is returned from the terminal end portion 42b of the oil cooler pipe 42 to the transmission section.
[0046]
Further, the heated return fuel sent from the engine E is caused to flow in from the starting end 43a of the fuel cooler pipe 43, and the fuel is cooled in the fuel cooler pipe 43. Thereafter, the fuel cooler pipe 43 is cooled. Cooled fuel is supplied to the engine E from the terminal end 43b of the engine 43.
[0047]
Therefore, the horsepower shortage due to the fuel temperature rise can be eliminated.
[0048]
【The invention's effect】
(1) According to the first aspect of the present invention, the oil pan is disposed between a pair of left and right front and rear extension frames forming a part of the body frame by extending in the front and rear direction, while forming both front and rear extension frames. An oil pan protector is provided between the bodies to cover the lower side and the left and right sides of the oil pan with the oil pan protector, and a cooling air flow path is provided between the upper surface of the oil pan protector and the lower surface of the oil pan. Has formed.
[0049]
In this way, since the oil pan protector covers the lower side and the left and right sides of the oil pan, even if a stone or the like scatters to the oil pan side while the aircraft is running, the oil pan protector protects the oil pan. The bread can be protected and the oil pan can be reliably prevented from being damaged.
[0050]
In addition, since the cooling air flow path is formed between the upper surface of the oil pan protector and the lower surface of the oil pan, the cooling air blown from the cooling fan provided in the front part of the engine flows rearward through the cooling air flow path. The oil pan can be reliably cooled by the cooling air rectified through the cooling air flow path.
[0051]
As a result, the oil temperature of the working oil in the oil pan and the ambient temperature of the engine can be maintained at required appropriate temperatures.
[0052]
(2) According to the second aspect of the present invention, the oil pan is formed with a concave portion in the front portion and a step is provided between the front bottom surface and the rear bottom surface, so that the front bottom surface and the oil pan protection body are separated from each other. A vertically wide inlet-side cooling flow path is formed therebetween, and a vertically narrow narrow outflow-side cooling flow path is formed between the rear bottom surface and the oil pan protector.
[0053]
In this way, since the inlet-side cooling flow path is formed vertically wide, the introduction and intake of cooling air can be made smooth and reliable, and the outlet-side cooling flow path is formed narrower vertically. Therefore, the flow velocity of the cooling air that has been smoothly and reliably introduced and taken in can be increased in the outflow-side cooling passage, and the cooling efficiency of the oil pan and the engine can be increased.
[Brief description of the drawings]
FIG. 1 is an explanatory side view of a tractor front part according to the present invention.
FIG. 2 is a sectional front view of the engine.
FIG. 3 is an explanatory side view of a front portion of a tractor as another embodiment.
FIG. 4 is a sectional front view of the engine.
FIG. 5 is a partially cutaway side view of a motor unit as another embodiment.
FIG. 6 is a sectional rear view of the motor unit.
FIG. 7 is a perspective view of a radiator as another embodiment.
FIG. 8 is a perspective view of a cooler unit.
[Explanation of symbols]
A Tractor 1 Body frame 2 Motor unit 3 Operating unit 4 Front axle case 5 Front wheels

Claims (2)

In a tractor with an engine mounted on the body frame, a cooling fan provided in the front of the engine, and cooling air sent from the cooling fan guided to an oil pan provided at the bottom of the engine,
While disposing the oil pan between a pair of left and right front and rear extension frame forming bodies extending in the front and rear direction to form a part of the body frame, an oil pan protector is erected between both front and rear extension frame forming bodies, A tractor, wherein the oil pan protector covers the lower side and the left and right sides of the oil pan, and a cooling air flow path is formed between an upper surface of the oil pan protector and a lower surface of the oil pan. The oil pan has a recess at the front and a step between the front bottom and the rear bottom to form a wide inlet-side cooling passage between the front bottom and the oil pan protector. 2. The tractor according to claim 1, wherein an outflow-side cooling passage having a narrow upper and lower width is formed between the rear bottom surface and the oil pan protector.

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