JPH09303537A - Oil tank structure for tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the reduction of the minimum ground height of a tractor, even with an oil tank installed under a transmission case, and easily clean even the internal space of the oil tank in such a state as having a lid body demounted, by forming the lid body as a tank guard for protecting the oil tank. SOLUTION: An oil tank 32 is made of a tank body 33 having a lower end open and formed out of an upper wall 33a, right and left side walls, and front and rear walls 33c and 33d, as well as a lid body 34 for closing the lower end opening of the tank body 33 and forming the bottom wall thereof. Also, the tank body 33 is made of casting such as cast aluminum, and the lid body 34 is made of steel plate. In addition, a material thick enough to prevent damages due to the collision of an obstacle such as stone on the ground is used for the the lid body 34 and consequently, the lid body 34 functions as the guard of the oil tank 32. In this case, the lid body 34 is detachably mounted on the lower surface of the tank body 33 with bolts 36, and a cleaning work can be easily controlled by demounting the lid body 34, as the tank body 33 has the lower end open.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an oil tank arranged below a mission case of a tractor.

[0002]

2. Description of the Related Art In a tractor, the oil in the transmission case is used as hydraulic fluid for hydraulic equipment equipped / mounted on the tractor, but when the hydraulic equipment is used frequently, the oil temperature rises too much. Therefore, in order to increase the capacity of the mission oil, it is considered to provide an oil tank below the mission case that communicates with the case.

[0003]

When the oil tank is arranged below the mission case, a guard is required to prevent damage to the oil tank when it is pushed up by stones or rocks on the ground side. However, when the guard is provided, there is a problem that the minimum ground clearance of the tractor becomes low and the number of parts increases, resulting in high cost.

Further, when the oil tank is made of a thick iron plate, the oil tank arranged below the mission case is necessarily formed in a flat shape in order to secure the ground height of the tractor. There arises a problem that cleaning management becomes difficult. Therefore, an object of the present invention is to provide an oil tank structure for a tractor aiming to solve the above problems.

[0005]

The technical means taken by the present invention to achieve the above-mentioned object is a tractor in which an oil tank 32 is arranged below a mission case 5, and the oil tank 32 is opened at the lower end. Tank body 3
3 and a lid 34 that is attached to the lower surface side of the tank body 33 and closes the lower end opening of the tank body 33. The lid 34 serves as a tank guard that protects the oil tank 32. To do.

Also, on the left and right sides of the mission case 5,
A pair of left and right side frame members 25 that support the working machines 2 and 3 mounted on the tractor vehicle body 1A are provided.
It is also characterized in that an oil tank 32 is arranged between them. Further, the oil filter 52 is attached to the tank body 33, and a part of the lid 34 is extended below the oil filter 52 to form a filter guard portion 53 for protecting the oil filter 52. To do.

An insertion hole 45 is formed in the upper wall 33a of the tank main body 33, and a cylindrical connecting member 47 which is inserted into the insertion hole 45 and communicates with the inside of the mission case 5 is provided on the bottom wall of the mission case 5. It is also characterized in that the seal member 49 is fixed and provided between the outer peripheral surface of the connecting member 47 and the inner peripheral surface of the insertion hole 45. Further, a flange 46 is provided on the upper end side of the connecting member 47, and the upper end side of the insertion hole 45 is chamfered,
A seal member 49 is also provided between the chamfered portion 50 and the flange 46.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 9, 1 is a tractor,
A front loader 2 is mounted on the front part of the tractor 1, and a backhoe 3 is mounted on the rear part. Tractor 1
The vehicle body 1A is configured by directly connecting the engine 4, the flywheel housing, the clutch housing, the transmission case 5, and the like in the front-rear direction, and the front axle frame 6 is provided so as to project from the side surface of the engine 4 to the front side. Reference numeral 7 is a front wheel, and 8 is a rear wheel provided on a rear axle 9.

As shown in FIG. 10, the tractor vehicle body 1A
Rear axle cases 10 that support the rear axle 9 are provided on the left and right sides of the rear portion so as to project outward from the mission case 5 in the left-right direction. The left and right rear axle cases 10 each have a rear wheel fender 1.
1 is attached, and a driver's seat 12 is arranged on the tractor body 1A between the left and right rear wheel fenders 11. The front loader 2 includes a pair of left and right masts 13 and left and right masts 1.
3, a boom 14 pivotally attached to the upper part of the upper and lower parts 3 of the rocker 3, a bucket 15 attached to the tip ends of the left and right booms 14 so as to be squeeze-dumpable, and a brace 16 provided between the mast 13 and the boom 14. It is mainly composed of and.

The backhoe 3 has a swing bracket 18 pivotally attached to the rear portion of the machine frame 17 so as to be able to swing left and right, and a boom 1 pivotally attached to the swing bracket 18 so as to be vertically swingable.
9, an arm 20 pivotally attached to the tip end side of the boom 19, a bucket 21 attached to the tip end side of the arm 20 so as to be squeezed and dumped, and provided on both left and right sides of the machine frame 17. It is mainly composed of an outrigger 22.

A support frame 23 for mounting and supporting the front loader 2 and the backhoe 3 is attached and fixed to the tractor body 1A.
The main frame 3 is composed of a front frame 24 and a pair of left and right side frames 25. The front frame 24 is formed of a circular pipe, is disposed in the left-right direction below the tractor vehicle body 1A so as to cross the vehicle body 1A, and fits and fixes the lower portion of the mast 13 of the front loader 2 on both left and right sides. A mast mounting portion 26 is provided for this purpose. Further, a pair of left and right mounting plates 27 that are fastened together with the front axle frame 6 are welded and fixed to the side surface of the engine 4 on the center side in the left-right direction of the front frame 2.

The left and right side frames 25 are arranged on the left and right sides of the tractor vehicle body 1A in the front-rear direction and have a front portion connected to the front frame 24, and side surfaces fixed to the rear portion of the square pipe 25A. It is mainly composed of a triangular frame 25B having a substantially triangular shape and a reinforcing plate 25C that reinforces the fixation of the square pipe 25A and the triangular frame 25B. It is freely attached and supported.

The rear parts of the left and right triangular frames 25B are connected to each other by upper and lower connecting members 28 and 29, and the upper and lower connecting parts for detachably mounting the machine frame 17 of the backhoe 3 on the rear parts of the left and right triangular frames 25B. 30 and 31 are provided. As shown in FIGS. 1 to 10, an oil tank 32 is arranged below the mission case 5 and between the left and right square pipes 25A. The oil tank 32 communicates with the mission case 5 and increases the capacity of the mission oil. The mission oil is used as hydraulic oil for various hydraulic devices, and the increase in the capacity of the mission oil by the oil tank 32 suppresses the increase in the oil temperature due to the small capacity.

The oil tank 32 has a tank main body 33 having an upper end 33a, left and right side walls 33b, front and rear walls 33c and 33d, and a bottom wall of the oil tank 32 that is closed by closing the lower end opening of the tank main body 33. It is composed of the constituting lid 34. The tank body 33 is made of a casting made of aluminum or the like, the lid 34 is made of an iron plate, and the lid 34 is a thick plate material capable of preventing damage caused by impact of an obstacle such as a stone on the ground side. Therefore, the lid 34 serves as a guard (protector) of the oil tank 32. Further, as shown in FIGS. 2 and 10, the left and right sides of the oil tank 32 are provided with the right and left square pipes 25.
Protected by A.

A plurality of screw-in portions 35 having screw holes are formed in the lower portion of the outer peripheral surface of the tank body 33 so as to bulge out and penetrate the lid 34 to be screwed into the screw-in portions 35. A lid 34 is detachably attached to the lower surface of the tank body 33 by 36. Therefore, the lid 34
When the tank is removed, the tank body 33 is open downward,
Easy cleaning management.

Further, as shown in FIG. 3, in particular, at the lower left and right end portions of the rear wall 33d of the tank body 33, screw-in portions 37 having screw holes 37a are formed so as to bulge from the upper surface.
On the other hand, a bracket 38 made of a plate material is attached and fixed to the front part of the side surface of the rear axle case 10 via a bolt 39 for attaching and fixing the rear axle case 10 to the mission case 5, and the lower portion of the bracket 38 is fixed. The rear portion of the oil tank 32 is attached and supported by a bolt 40 that penetrates the wall 38a and is screwed into the threaded portion 37.

Further, as shown in FIGS. 1, 2 and 4, screw-in portions 41 having screw holes 41a are formed from the upper surface on both left and right front portions of the upper wall 33a of the tank body 33 so as to bulge upward. The cover plate 4 that is formed and covers the mission case 5 on the other hand
A bracket 43 is welded and fixed to the left and right side surfaces of 2, and a front portion of the oil tank 32 is attached and supported by a bolt 44 that penetrates a lower wall 43a of the bracket 43 and is screwed into the screwed portion 41. Has been done. The cover plate 42 is attached to the mission case 5.

As shown in FIGS. 1, 4 and 6, a circular insertion hole 45 is formed in the rear portion of the upper wall 33a of the tank main body 33, and the insertion hole 45 has a flange 46 integrally formed therein. The connecting member 47 in the shape of a circle is inserted. This connecting member 4
7 is fixed by attaching the flange 46 to the bottom wall of the mission case 5 with a bolt (or welding),
The hole 47a on the inner peripheral side is communicated with the inside of the mission case 5, and the hole 47a communicates with the inside of the mission case 5 and the inside of the oil tank 32. Therefore, when oil is supplied to the mission case 5, the oil tank 32 is first supplied with oil, and when the oil tank 32 is full, oil is supplied into the mission case 5.

A peripheral groove 48 is formed on the outer peripheral surface of the connecting member 47, and an O-ring 49 for sealing between the inner peripheral surface of the insertion hole 45 and the outer peripheral surface of the connecting member 47 is fitted into the peripheral groove 48. Has been done. Further, the upper end side of the insertion hole 45 is chamfered, and an O ring 51 is also provided between the chamfered portion 50 and the lower surface base side of the flange 46. With this configuration, a deviation (error) in mounting accuracy of the oil tank 32 can be absorbed, and even if the oil tank 32 is mounted in a slightly inclined shape with respect to the bottom wall of the mission case 5, oil leakage does not occur, and When the oil tank 32 is pushed up from below by stones, rocks, or the like, the followability is good, and oil leakage due to the pushup does not occur.

The left side of the tank body 33 is recessed rearward, and a space S for arranging the oil filter 52 is formed on the left side of the tank body 33. The oil filter 52 is located on the left side of the front wall 33c. It is attached to the surface facing. Then, the oil in the oil tank 32 is sucked by the hydraulic pump driven by the engine 4 via the oil filter 52 and is sent from the hydraulic pump to various hydraulic equipment. The oil that has passed through the hydraulic equipment is the transmission case 5 or the oil tank. It is configured to be returned to 32.

The front portion of the lid 34 has a tank body 3 in plan view.
3 is extended to the left so as to project from 3, and this extended portion is located below the oil filter 52 and serves as a filter guard portion 53 that protects the oil filter 52. On the left side surface of the transmission case 5, a hydrostatic transmission (H
The oil filter 54 for ST) is attached. The upper wall 3 of the tank body 33 below the oil filter 54.
A recess 55 is formed in 3a, and the bottom surface of the recess 55 is
As shown in FIG. 7 and FIG. 8, it is inclined so as to move downward as it goes outward in the left-right direction, and the oil spilled when the oil filter 54 is attached or detached does not collect on the upper wall 33a of the tank body 33. It is like this.

In FIG. 1, reference numeral 56 is a suction filter for sucking oil into another hydraulic pump.

[0023]

According to the present invention, in the tractor in which the oil tank 32 is arranged below the mission case 5, the oil tank 32 is opened at the lower end of the tank body 3.
3 and a lid 34 that is attached to the lower surface of the tank body 33 and closes the lower end opening of the tank body 33. The lid 34 serves as a tank guard that protects the oil tank 32. Even if the oil tank 32 is arranged below the oil tank 5, a guard for protecting the oil tank 32 is not required separately, and it is possible to prevent the ground clearance of the tractor from being lowered due to the provision of the guard. The inside of the tank can be easily cleaned by removing the.

On both the left and right sides of the mission case 5,
A pair of left and right side frame members 25 that support the working machines 2 and 3 mounted on the tractor vehicle body 1A are provided.
By arranging the oil tank 32 between them, the left and right sides of the oil tank 32 can be protected. Further, the oil filter 52 is attached to the tank body 33, and a part of the lid 34 is extended below the oil filter 52 to form a filter guard portion 53 for protecting the oil filter 52. A structure in which the filter 52 is directly attached to the oil tank 32 can be adopted.

An insertion hole 45 is formed in the upper wall 33a of the tank body 33, and a cylindrical connecting member 47 which is inserted into the insertion hole 45 and communicates with the inside of the mission case 5 is provided on the bottom wall of the mission case 5. By fixing and providing the seal member 49 between the outer peripheral surface of the connecting member 47 and the inner peripheral surface of the insertion hole 45, the oil tank 32 and the mission case 5 are separated from each other when the oil tank 32 is pushed up from below. The connection portion has good followability, oil leakage from the connection portion does not occur, and due to an error in mounting the oil tank 32, the oil tank 32 is slightly inclined with respect to the mission case 5 compared to the installation setting state. Even if the error occurs, the error can be absorbed, and oil leakage due to this error will not occur.

A flange 46 is provided on the upper end side of a connecting member 47 fixed to the bottom wall of the mission case 5.
The upper end side of the insertion hole 45 formed in the upper wall 33a of the tank body 33 is chamfered, and the chamfered portion 50 and the flange 46 are formed.
By providing the seal member 49 between and, the sealing performance is ensured when the oil tank 32 is pushed up from below or when a tank mounting error occurs.

[Brief description of drawings]

FIG. 1 is a side sectional view of an oil tank.

FIG. 2 is a front sectional view showing a front side mounting structure of an oil tank.

FIG. 3 is a side sectional view showing a rear side attachment structure of an oil tank.

FIG. 4 is a plan view of an oil tank.

FIG. 5 is a bottom view of the oil tank.

FIG. 6 is a side sectional view showing a connection structure between an oil tank and a transmission case.

FIG. 7 is a side view showing a partial structure of the upper surface of the oil tank.

FIG. 8 is a front sectional view showing a partial structure of the upper surface of the oil tank.

FIG. 9 is an overall side view of the tractor showing a state in which a front loader and a backhoe are mounted.

FIG. 10 is a plan view of a support frame, an oil tank, and the like.

[Explanation of symbols]

 1A Tractor body 2 Front loader 3 Backhoe 5 Mission case 25 Side frame material 32 Oil tank 33 Tank body 34 Lid

Claims (5)

[Claims] 1. A tractor in which an oil tank (32) is arranged below a mission case (5), wherein the oil tank (32) comprises a tank main body (33) having an opening at a lower end, and the tank main body (33). A tank guard for protecting the oil tank (32), which is composed of a lid (34) attached to the lower surface side and closing the lower end opening of the tank body (33). Oil tank structure for tractor. 2. The left and right sides of the mission case (5),
A work machine (2) mounted on the tractor body (1A),
The tractor oil according to claim 1, wherein a pair of left and right side frame members (25) for supporting (3) are provided, and an oil tank (32) is arranged between these left and right side frame members (25). Tank structure. 3. The oil filter (52) is attached to the tank body (33), and a part of the lid (34) is extended below the oil filter (52) to provide the oil filter (52). Filter guard part (5
3) The oil tank structure for a tractor according to claim 1 or 2, wherein 4. A tubular connection which is formed with an insertion hole (45) in the upper wall (33a) of the tank body (33) and which is inserted into the insertion hole (45) and communicates with the inside of the mission case (5). The member (47) is fixed to the bottom wall of the mission case (5), and the outer peripheral surface of the connecting member (47) and the insertion hole (45).
4. The tractor oil tank structure according to claim 1, wherein a seal member (49) is provided between the oil tank structure and the inner peripheral surface. 5. A flange (46) is provided on the upper end side of the connection member (47), and the upper end side of the insertion hole (45) is chamfered.
The oil tank structure for a tractor according to claim 4, wherein a seal member (49) is provided between the chamfered portion (50) and the flange (46).