JP2001163064A - Front structure of tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling efficiency of a radiator. SOLUTION: A front axle case 6 is supported forwardly from an engine 2, a front frame 3 capable of vertically ventilating the air is projected, a radiator 4 capable of sucking the air from a front part is loaded on the front frame 3, and an oil cooler 5 is mounted on a vertical ventilation path inside of the front frame 3 at a front side with respect to the radiator 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front structure of a tractor used for farming, civil engineering and the like.

[0002]

2. Description of the Related Art For example, in an agricultural tractor, a transmission case is directly connected to an engine, a front frame protrudes forward from the engine, and a radiator is mounted on the front frame. The oil cooler that cools the oil is arranged in front of the radiator, and passes the air after cooling the oil cooler through the radiator.

[0003]

In the configuration in which the air after passing through the oil cooler cools the radiator as in the prior art, since the air passing through the oil cooler has a high temperature, it is necessary to sufficiently cool the radiator. It is difficult, and the cooling efficiency of the radiator is very low. An object of the present invention is to provide a front structure of a tractor capable of solving the problems of the related art.
The present invention provides a front structure of a tractor in which an oil cooler is disposed inside a front frame below and below a radiator so that the radiator does not suck air passing through the oil cooler and cooling efficiency of the radiator can be improved. The purpose is to provide.

[0004]

A first concrete means for solving the problem according to the present invention is to project a front frame 3 forward from an engine 2, mount a radiator 4 on the front frame 3, and mount the radiator 4 on the front frame 3. Front frame 3 before 4
That is, the oil cooler 5 is disposed inside. As a result, the air that has cooled the oil cooler 5 escapes below the front frame 3 without being sucked into the radiator 4.
The cooling efficiency of the radiator 4 is improved.

A second concrete means for solving the problem in the present invention is to support a front axle case 6 forward from the engine 2 and protrude a front frame 3 through which air can flow in the vertical direction. A radiator 4 capable of sucking air from the front is mounted on the upper side, and an oil cooler 5 is provided in a vertical air flow passage inside the front frame 3 on the front side of the radiator 4.
It is to arrange. As a result, the flow of air for cooling the radiator 4 and the flow of air for cooling the oil cooler 5 are separated, and the air cooled for the oil cooler 5 is not sucked into the radiator 4 and the front frame 3
And the cooling efficiency of the radiator 4 is improved.

A third specific means for solving the problem in the present invention is that, in addition to the first or second specific means, a return pipe 7 connected to the oil cooler 5 is provided rearward from below the radiator 4. It extends to the side of the engine 2 through the side. This prevents the return pipe 7 through which the cooled oil flows from being heated by the hot air discharged from the radiator 4.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4, a tractor 1 directly connects a transmission case 10 to an engine 2, projects a front frame 3 forward from the engine 2 to form a traveling vehicle body 11, and has a hydraulic device for lifting and lowering a work implement at a rear upper portion of the transmission case 10. A driver's seat is mounted, and a power steering control valve 14 of a steering device 13 is disposed at a front upper portion via a bracket 12.

A multiple hydraulic pump 15 is mounted on the side (right side) of the engine 2.
Is a control valve for an actuator such as a hydraulic clutch for traveling system, a hydraulic device for lifting and lowering a work machine, and a power steering cylinder in the transmission case 10 through supply pipes 17 and 18 for sucking oil in the transmission case 10 through a suction pipe 16. Hydraulic oil is supplied to the power steering control valve 14 of the (actuator).
The return oil from the power steering control valve 14 is supplied to the control valve 20 of the PTO clutch.
The oil cooler 5 is connected between the PTO clutch control valve 4 and the PTO clutch control valve 20 via a feed pipe 21 and a return pipe 7.

The front frame 3 has a front plate 3B fixed to the front ends of a pair of left and right side plates 3A fixed to the engine 2.
The center axle 6A of the front axle case 6 is supported so as to be swingable around the front-rear axis.
The radiator 4 is attached via the. The radiator 4 is of a pre-suction type that sucks air from the front side and sends cooling air to the engine 2. The front frame 3 has a front stand 24
A battery 26 is mounted above the front stand 24 via a battery stand 25, and the battery 26, the radiator 4, and the like are covered with a hood 27 together with the engine 2. The bonnet 27 can introduce outside air into the inside from the front grille portion 27A at the front, the lower side of the front side, and the like.

The interior of the front frame 3 including the front table 24 is hollow, and the battery table 25 is formed of a perforated plate or a plate having an opening, and has a gap between the battery 26 and the bottom surface thereof. The front grille 2
The air that has entered the hood 27 from 7A is the front frame 3
The wind flowing under the engine 2 through the inside or flowing under the front frame 3 draws air inside the front frame 3 to generate air circulation. Therefore, the previous frame 3
The inside is an air flow passage through which air flows vertically.

The oil cooler 5 disposed in the air flow passage inside the front frame 3 has a pipe shape of a U-shape in plan view.
It is formed in a loop shape by being bent into an S-shape or the like, and is supported by a support 29 attached to the left and right side plates 3A. The feed pipe 21 and the return pipe 7 which are connected to both ends of the oil cooler 5 so as to be freely connected and disconnected come out from the lower part of the radiator 4 to the rear side thereof, rise up to the right side of the front frame 3, and go out to the right of the front frame 3.
Is extended to the side of the engine 2 through the rear side of the engine 2 and supported by a fixture 28 projecting rightward from the engine 2, bent near the bracket 12, and the feed pipe 21 is connected to the power steering control valve. , The return pipe 7 is extended downward and
Each is connected to a clutch control valve 20.

During traveling, the tractor 1 cools the radiator 4 by entering air from the front grill 27A and also flows into the front frame 3 to cool the oil cooler 5. Even when the vehicle is stopped, the air suction force of the radiator 4 acts, so that air flows in from the front grill 27A and the like, and cools the radiator 4 and the oil cooler 5 separately, thereby efficiently cooling each of them. Since the return pipe 7 extends from below the radiator 4 to the side of the engine 2 through the rear side, the hot air discharged from the radiator 4 does not hit as much as possible, and the return pipe 7 is cooled by the oil cooler 5. The discharged oil does not receive heat from the discharged hot air.

The lower front part of the bonnet 27 is located at substantially the same height as the upper edge of the front base 24, and the rear part of the front base 24 is bent to form a receiving part 30 one step lower than the front part.
The receiving portion 30 is located below and in front of the radiator 4. The radiator 4 has its lower part lower than the front lower part of the bonnet 27 and the upper edge of the front stand 24 so that its surface area is as large as possible.
Are provided detachably. Insects, dust, and the like that are prevented from being sucked into the radiator 4 by the insect net 31 fall due to the vibration of the tractor 1 and accumulate in the receiving portion 30.
Since the receiving portion 30 is one step lower than the lower front portion of the bonnet 27 and the upper edge of the front base 24, it is convenient to accumulate insects and dirt. However, it is difficult to clean the front side, the upper side, etc. You have to clean by inserting etc.

When the side surface of the receiving portion 30 is opened, air for cooling the radiator 4 or the oil cooler 5 or air after cooling may flow there.
The side surface of the receiving portion 30 is closed by a lid 32 which can be detachably attached to 5. The lid 32 can be attached and detached from the side of the radiator 4 when the front side is raised with the bonnet 27 centered at the rear and opened, and when the lid 32 is removed, the receiving portion 30 can be cleaned extremely easily. . 3 and 5, the tractor 1 is exemplified as a four-wheel drive type, and a front wheel differential device is incorporated in a substantially central portion of a front axle case 6, and an input shaft 35 of the front wheel differential device is provided on a rear side. Center shaft part 6A.

The input shaft 35 is connected to a transmission shaft 36 projecting from the transmission case 10 via a propulsion shaft 37, and a shaft cover 38 surrounding these is connected to a center shaft portion 6A.
And the transmission case 10. Since the propulsion shaft 37 is long, if it is rotated at high speed, the shaking in the middle of the shaft increases, and the shaft cover 38 may be damaged.
Therefore, a midway portion of the propulsion shaft 37 is supported by a bearing member 40 via a bearing 39, and the bearing member 40 is bolted to an oil pan 41 below the engine 2, and the bearing member 40 reduces the deflection of the propulsion shaft 37. I try to make it.

The shaft cover 38 includes a first cover 38A supported on the center shaft portion 6A side, a third cover 38C supported between the transmission case 10 and the bearing member 40,
It has a second cover 38B provided between the bearing member 40 and the first cover 38A, and a rear part of the first cover 38A is fitted to a front part of the second cover 38B. Note that the present invention is not limited to the above embodiment, and can be variously modified. For example, the oil cooler 5 may be a commercially available oil cooler instead of a pipe, and the return pipe 7 may be connected to the transmission case 10 to return the cooled oil into the transmission case 10. .

[0017]

According to the present invention described in detail above, the flow of air for cooling the radiator 4 and the flow of air for cooling the oil cooler 5 can be separated, and the air cooled for the oil cooler 5 is supplied to the radiator 4. Without being sucked, it escapes below the front frame 3 and the cooling efficiency of the radiator 4 can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a main part showing an embodiment of the present invention.

FIG. 2 is a plan view of the main part.

FIG. 3 is a side view of the inside of the front of the tractor.

FIG. 4 is an exploded perspective view showing a structure of a lower front part of the radiator.

FIG. 5 is a sectional view showing a front wheel drive propulsion shaft and a shaft cover.

[Explanation of symbols]

 2 Engine 3 Front frame 4 Radiator 5 Oil cooler 6 Front axle case 7 Return pipe 14 Power steering control valve 15 Hydraulic pump 20 PTO clutch control valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideaki Dozono 64, Ishizukita-cho, Sakai City, Osaka Prefecture Inside the Kubota Sakai Works (72) Inventor, Rumio Umemoto 64, Ishizukitacho, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. Inside the factory (72) Inventor Takao Nishikawa 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture Inside the Kubota Sakai Factory (72) Inventor Kazuo Furukawa 64, Ishizu-Kitamachi, Sakai City, Osaka Prefecture F-term (Reference) 3D003 AA08 AA18 BB13 CA04 CA09 DA03 DA04 DA09 3D038 AA04 AA05 AA07 AA10 AB06 AC00 AC01 AC06 AC11 AC23 AC27

Claims (3)

[Claims] 1. A front structure of a tractor, wherein a front frame protrudes forward from an engine, a radiator is mounted on the front frame, and an oil cooler is disposed inside the front frame on a front side of the radiator. . 2. A front frame which supports a front axle case forward from an engine and allows air to flow in a vertical direction, and a radiator capable of sucking air from the front is mounted on the front frame. A front structure of a tractor, wherein an oil cooler is arranged in a vertical air flow passage inside a front frame. 3. The tractor according to claim 1, wherein a return pipe connected to the oil cooler extends from below the radiator to a side of the engine through a rear side of the radiator. Front structure.