JP2004074939A - Frame structure for tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems such as reduction in lateral width around a front wheel mounting part in a vehicle body front part and restriction of a cutting angle of a front wheel in a conventional tractor body frame, in which a pair of left and right supporting members are extended in the longitudinal direction and the lateral width is substantially constant from the front end to the rear end of the body frame. <P>SOLUTION: In the tractor, an engine is arranged in the front part, a transmission case is arranged in the rear part, and the engine and the transmission case are supported by means of the vehicle body frame. A pair of left and right vehicle body frames 21 are extended longitudinally from the engine mounting part to the transmission case, so that the width between the left and right vehicle body frames is narrower in the front part 21a in comparison with that in the center part 21b. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technology of a vehicle body support frame that supports a tractor engine, a clutch housing, and the like.
[0002]
[Prior art]
Conventionally, in order to support the body of a tractor, a pair of left and right pipe-shaped or plate-shaped members are extended in the front-rear direction to form a body frame, and an engine or a transmission case is attached to the body frame to support it. Are known. For example, the technology described in Japanese Utility Model Application Laid-Open No. 61-110428 and the technology described in Japanese Patent Application Laid-Open No. 63-127032.
In this configuration, the vehicle body frame extends from the front end portion to the rear portion of the vehicle body, the engine is supported on the front portion of the vehicle body via a vibration isolating mechanism, and the engine is covered with a bonnet. Further, the transmission case is fastened and fixed with bolts or the like so as to sandwich the front side of the transmission case at the rear of the body frame. The floor on which the driving section is disposed has a support member projecting outward from both left and right ends near the center of the body frame to form steps in the support member.
[0003]
[Problems to be solved by the invention]
However, in a conventional tractor body frame structure in which a pair of left and right body frames extend in the front-rear direction, the left and right widths are substantially the same from the front end to the rear end of the body frame. A mounting member for adjusting the size between devices and members to be used is required.
Therefore, when the left and right body frames are arranged according to the width of the transmission case, the width of the engine mounting part becomes wider, so that sufficient clearance cannot be obtained between the front wheels and the body frame, and the turning angle of the front wheels is limited. I was Conversely, in a configuration in which the front wheel is configured to be narrower than the above so as to secure the turning angle of the front wheels and allow the engine to be mounted, and only the front portion of the vehicle body frame is positioned upward, Since the position of the member mounted on the part is also increased, there is a problem that the member causes a blind spot in a field of view ahead of the driver from the driving part.
Further, in the narrow configuration, the clutch housing is disposed between the pair of left and right body frames at the rear of the engine. Therefore, the clutch housing must be large enough to be disposed within the left and right widths of the body frame. The size of the housing could not be increased, and the capacity of the clutch was limited.
[0004]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0005]
That is, in the tractor in which the engine is disposed at the front and the transmission case is disposed at the rear, and the engine and the transmission case are supported by the vehicle body frame, a pair of right and left vehicle bodies are mounted on the engine. It extends in the front-rear direction from the mounting portion to the transmission case, and the width between the left and right body frames is configured such that the front portion is narrower than the center portion and the center portion is gradually widened.
[0006]
According to a second aspect of the present invention, a pair of left and right body frames extend in a front-rear direction in a tractor in which an engine is arranged at a front part, a transmission case is arranged at a rear part, and the engine and the transmission case are supported by the body frame. The left and right widths are gradually reduced from the center to the rear of the body frame, and the rear end of the body frame is fixed to the front of the transmission case.
[0007]
According to a third aspect of the present invention, there is provided a tractor having an engine disposed at a front portion, a transmission case disposed at a rear portion, and supporting the engine and the transmission case by a vehicle body frame. The front portion of the vehicle body frame is formed of a plate-shaped member, and the rear portion is formed of a hollow cylindrical member.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the invention will be described.
1 is a side view showing a configuration of a tractor having a vehicle body frame structure according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a perspective view of a vehicle body frame, FIG. 4 is a plan view thereof, FIG. FIG. 6 is a sectional view taken along line AA of FIG.
[0009]
First, the overall configuration of a tractor 1 using a vehicle body frame structure according to the present invention will be described with reference to FIGS.
The tractor 1 has a vehicle body frame 21 formed from the front end to the rear of the vehicle body. Front wheels 3.3 are supported on a front lower portion of the vehicle body frame 21 via a front axle case 15. The rear wheels 4 are supported by a transmission case 9 fixedly mounted on a rear axle case.
At the front of the vehicle body frame 21, the engine 5 is mounted via an anti-vibration member on engine support members 22 fixed to the vehicle body frame 21, and in front of the engine 5, a radiator 6 and A battery 7 is provided. The engine 5, the radiator 6, and the battery 7 are covered with a hood 8. Further, the clutch housing 11 attached to the rear of the engine 5 is placed and supported on support members 28 fixed to the rear portion of the vehicle body frame 21 via vibration isolating members. The transmission case 9 is fastened and fixed, and the engine 5 and the transmission case 9 are connected via a power transmission mechanism 10 such as a transmission shaft or a universal joint.
Cabin support members 23, 23 each formed by bending a plate-like member are fixed in the horizontal direction from the outer surface of the front and rear central portion of the body frame 21. The cabin 12 extends from the rear portion of the body frame 21 to the transmission case 9. It is placed above and fixed at the cabin support members 23. A driving unit including a steering handle 13, a seat 14, and the like is installed inside the cabin 12.
[0010]
Next, the configuration of the body frame 21 will be described.
As shown in FIGS. 3, 4 and 5, a vehicle body frame 21 of the tractor 1 according to the present invention includes front frames 24, 24 each formed of a pair of left and right flat plate members at a front portion. A front connection frame 25 for connecting and reinforcing the left and right sides, a radiator mounting frame 29, a support plate 30 for attaching a front axle case, and a cylindrical member at the rear end of the front frames 24. The rear frames 26, 26 and the connection frame 31 for connecting and reinforcing the rear frames 26, 26 are integrally formed.
The front connection frame 25 is formed of a flat plate, and is disposed so as to function as a bumper by fixing the front frames 24, 24 between the front ends in the left-right vertical direction.
The front frames 24 are arranged in front of each other in parallel to each other in the front-rear direction, so that the left and right widths of the front of the body frame 21 are substantially the same.
The front frames 24 are bent outward in the left-right direction at the rear, and are formed in a "C" shape in plan view so that the distance between the front frames 24 and 24 gradually increases behind the bent portion. The rear frames 26, 26 fixed to the rear ends of the front frames 24, 24 are angled with respect to the front frames 24, 24 so that the distance between the rear frames 26, 26 becomes narrower as it goes backward. They are arranged in an inverted “C” shape in plan view. As shown in FIG. 6, the rear frame 26 is formed by joining two cylindrical members having a substantially rectangular cross section and the same shape by welding or the like so as to be in contact with each other at upper and lower ends. Further, flange portions 27, 27 for connecting and fixing to the front surface of the transmission case 9 are fixed to the rear ends of the rear frames 26, 26, respectively. The flange portion 27 is formed as a flat plate having a surface (front and rear surfaces) substantially perpendicular to the longitudinal direction of the rear frame 26.
[0011]
The vehicle body frame 21 is configured as described above, and the vehicle body frame 21 is divided into the following three according to its shape and constituent members. A left and right width is gradually increased from the front to the rear by a frame front portion 21a having a front portion and a front connection frame 25 and having substantially the same left and right widths in the front and rear, and the rear frames 26. It can be divided into a frame rear part 21c configured to be narrow and a frame central part 21b arranged between the rear part of the front frames 24 and the rear frames 26.
[0012]
As shown in FIGS. 1 and 2, in the frame front portion 21 a, the mounting plate 32 is mounted and fixed on the front frames 24 and the radiator mounting frame 29, and the radiator 6 is mounted on the mounting plate 32. And the battery 7 are placed. A support plate 30 is provided laterally in the middle of the front frames 24, 24, and the front axle case 15 is supported below the support plate 30 so as to be tiltable left and right.
In the center part 21b of the frame, an engine support member 22 is formed by projecting upward from the front part of the bent part of the front frame 24 on the right side in the traveling direction. An engine support member 22 is formed by projecting a plate from the rear portion of the bent portion into a く shape when viewed from the front, and a cutout or a bolt hole is opened in the upper portion of the engine support member 22 for fixing with a bolt or the like. I have.
In the frame rear portion 21c, the front end of the rear frame 26 is obliquely cut so that the front portion is pointed in a plan view, and the rear end inner surface of the front frame 24 is fixed to the cut portion to form a connection portion. In the connecting portion, the rear part of the front frame 24 is fixed above the two cylindrical members at the front end of the rear frame 26, and is fixed so that the front frame 24 is at a high position.
Cabin support members 23, 23 each having a plate formed in a gate shape in a side view, are provided outside the connecting portion so as to protrude in the outer horizontal direction. The lower ends of the columns of the cabin 12 are fixed to the cabin support members 23 and the rear transmission case 9 or rear axle case. A connecting frame 31 is laterally provided between the front portions of the rear frames 26, 26, and a supporting member 28 is provided at the rear position of the connecting frame 31 by bending a plate from the inner side surface of the rear frames 26, 26 into an L shape in cross section. 28 protrudes obliquely inward and upward. The clutch housing 11 attached to the rear of the engine 5 is supported by the support members 28 via a vibration isolator, and the engine 5 is supported by the engine support members 22 via the vibration isolator. Since the support member 28 is fixed over the rear frame 26 and the connection frame 31, it is possible to reinforce the widened portion in the left-right direction.
Thus, the engine 5 is mounted on the narrow portion of the front portion 21a of the frame, and the clutch housing 11 is positioned on the wide portion of the central portion 21b of the frame.
The rear frames 26 are fixed to the front end of the transmission case 9 via the flanges 27 at the rear ends. The flange portion 27 is formed by bending the plate into an L-shape in a plan view, and bending the plate inward so as not to protrude to the side, so that the plate can be fixed within the width of the transmission case 9.
[0013]
By arranging the vehicle body frame 21 and the members supported by the vehicle body frame 21 and constituting the vehicle body of the tractor 1 in this manner, the following advantages can be obtained.
First, the left and right widths of the front portion 21a of the frame are made narrower than the center portion 21b of the frame. The left-right width can be further reduced. Therefore, the distance between the front wheels 3 and the vehicle body can be made wider without moving the position of the frame front portion 21a upward with respect to the frame center portion 21b and the rear portion 21c. This makes it possible to increase the turning angle of the front wheels 3 without reducing the field of view from the vehicle, thereby reducing the turning radius. Further, the frame front portion 21a is connected in a ladder shape by the front frames 24, 24, the front connection frame 25, the radiator mounting frame 29, and the support plate 30, so that they are reinforced with each other to increase rigidity. The left-right width of the frame front part 21a can be further reduced.
[0014]
Further, in the vehicle body frame structure according to the present invention, the front frame 26 has a “C” shape in plan view so as to enlarge the left and right width of the frame central portion 21b, in contrast to the configuration in which the left and right widths of the body frame are equal in the front and rear. It is possible to increase the torsional stiffness by bending the stiffness. Then, the clutch housing 11 can be arranged in the frame central portion 21b of the expanded space, the clutch housing 11 can be made larger, and a larger-capacity clutch can be used. In addition, since the cabin support members 23 are fixed to the wider central portion 21b of the frame, the length of the support member 23 in the left-right direction can be reduced, and the support rigidity of the support member 23 increases. Therefore, rigidity can be ensured even when the thickness of the support member 23 is smaller than that of the conventional configuration, so that material cost can be reduced. Further, the cabin 12 can be stably supported.
[0015]
Since the left and right widths of the frame rear portion 21c are configured to be narrower as they move rearward, the transmission case 9 conventionally fixed so as to be sandwiched between the left and right frame members is connected to the rear end of the vehicle body frame 21. With this configuration, maintenance can be performed from the side surface of the transmission case 9 so that the vehicle body frame is not obstructed, and the work can be performed more easily.
Further, the transmission case 9 can be firmly supported by the rear frames 26, and the torsional rigidity of the frame rear portion 21c can be increased.
Even if the rear frame 26 is composed of only one hollow rear frame, the effect of improving the torsional rigidity can be obtained. However, in this embodiment, the two hollow rear frames are bundled and fixed to the rear frame 26. By using the above, the rigidity of the frame rear portion 21c is further increased.
[0016]
In the present embodiment, the driving unit of the tractor 1 is arranged in the cabin 12, but the vehicle body frame structure of the tractor according to the present invention can be used for a tractor having no cabin.
[0017]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
[0018]
That is, in a tractor in which an engine is disposed at a front portion and a transmission case is disposed at a rear portion, and the engine and the transmission case are supported by the vehicle body frame, a pair of right and left vehicle body frames are provided. The tractor extends in the front-rear direction from the mounting portion to the transmission case, and the width between the left and right body frames is configured such that the front portion is narrower than the center portion and the center portion is gradually widened. The left and right width of the vehicle body in the vicinity of the front wheel mounting portion can be reduced, and the distance between the front wheel and the vehicle body can be made wider, so that the turning angle of the front wheel can be further increased. In addition, by disposing the clutch housing in a portion where the left and right widths are widened, the size of the clutch housing can be increased, and a larger capacity clutch can be used.
[0019]
According to a second aspect of the present invention, there is provided a tractor having an engine disposed at a front portion, a transmission case disposed at a rear portion, and supporting the engine and the transmission case by a vehicle body frame. The rear end of the vehicle body frame is fixed to the front of the transmission case, so that the torsional rigidity of the rear portion of the vehicle body frame is reduced. And the mission case can be more firmly supported. Further, in contrast to the conventional configuration in which the transmission case is sandwiched between the left and right vehicle body frame members, operations such as maintenance of the transmission case can be performed more easily.
[0020]
According to a third aspect of the present invention, there is provided a tractor in which an engine is disposed at a front portion, a transmission case is disposed at a rear portion, and the engine and the transmission case are supported by a vehicle body frame. The front part of the vehicle body frame is made of a plate-like member, and the rear part is made of a hollow cylindrical member, thus reducing the number of steps required for assembling the body frame and the number of parts. it can. Further, the load of the front engine or the like is supported by a plate-shaped member, and the engine and the transmission case are connected and supported by a cylindrical member having higher rigidity than the plate-shaped member, so that the support rigidity can be improved. Further, compared to a configuration in which the engine frame and the transmission case are connected by a clutch housing formed of a cylindrical casting, the configuration can be made lighter and cheaper.
[Brief description of the drawings]
FIG. 1 is a side view showing a configuration of a tractor having a vehicle body frame structure according to the present invention.
FIG. 2 is a plan view of the same.
FIG. 3 is a perspective view of a vehicle body frame.
FIG. 4 is a plan view of the same.
FIG. 5 is a side view of the same.
FIG. 6 is a sectional view taken along the line AA of FIG. 5;
[Explanation of symbols]
21 Body frame 21a Frame front 21b Frame center

Claims (3)

In a tractor that arranges an engine at the front and a transmission case at the rear, and supports the engine and the transmission case with the vehicle body frame, a pair of left and right vehicle body frames are used from the mounting portion of the engine to the transmission case. A tractor frame structure extending in the front-rear direction, wherein a width between the left and right body frames is configured such that a front portion is narrower than a center portion and the center portion is gradually widened. A tractor that arranges an engine at a front portion, a transmission case at a rear portion, and supports the engine and the transmission case by a vehicle body frame. A tractor frame structure, wherein the left and right widths are gradually reduced from the center toward the rear, and the rear end of the vehicle body frame is fixed to the front of the transmission case. A tractor that arranges an engine at the front and a transmission case at the rear and supports the engine and the transmission case with the vehicle body frame is constructed by integrally extending a pair of left and right vehicle body frames in the front-rear direction. A tractor frame structure, wherein a front portion of the vehicle body frame is formed of a plate-shaped member, and a rear portion is formed of a hollow cylindrical member.

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