JPH06166335A - Front pto case supporting structure for agricultural tractor - Google Patents

Abstract

PURPOSE:To permit a front PTO case equipped with a front PTO shaft to be connected in a compact form with the lower part of a machine body front side and permit also a three-point link mechanism for connecting a working device to be installed at the machine body front part at the same time, as for an agricultural tractor equipped with the left and right machine body front part frames in pair. CONSTITUTION:A front PTO case is connected with a machine body front part frame 3 so as to be demountable through a bracket 4 so that the front surface of the front PTO case is positioned inside a body from the front edge of the machine body front part frame 3 and the front PTO case is positioned between the machine body front part frame 3. Then, a three-point link mechanism constituted of a lower link 5, top link 6, and a hydraulic cylinder 7 is installed on the front side of the bracket 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an agricultural tractor,
The present invention relates to a support structure for a front PTO case that transmits power to a work device connected to a front end of a body front frame.

[0002]

2. Description of the Related Art An example of an agricultural tractor equipped with a front PTO case as described above is disclosed in Japanese Unexamined Patent Publication No. 56-99822.
It is disclosed in the publication. In this structure, the fuselage front frame (5 and 6 in FIGS. 2 and 3 of the publication)
A front PTO case (17 in FIG. 2 of the publication) is connected to the front end of the via a bracket (22 in FIGS. 2 and 4 of the publication).

[0003]

As described above, when the front PTO case is connected to the front end of the machine body front frame, the front PTO case is not connected when the working device is not connected to the machine body front frame. The front PTO case may come into contact with the ridges, especially when turning at a position close to the ridges, since the state is such that the front frame is projected from the front frame. In addition, when connecting the work device to the front frame of the machine body through the top link, the lower link, and the hydraulic cylinder for lifting the work device, the front PTO
Since the top link, lower link, etc. will be connected to the front frame of the machine body through a plurality of brackets different from the case bracket, the number of connection brackets will increase and the structure will be simplified. But there is room for improvement. The present invention prevents the front PTO case from coming into contact with the ridges during turning, and simplifies the connection structure of the top link, the lower link, and the hydraulic cylinder for lifting the working device to the body front frame. The purpose is to plan.

[0004]

The feature of the present invention resides in that the front PTO case supporting structure for an agricultural tractor as described above is configured as follows. That is, the front PT equipped with the front PTO shaft projecting to the front side of the fuselage
The O case is such that the front surface of the front PTO case is located closer to the inside of the body than the front ends of the pair of left and right body front frames, and the front PTO case is located between the left and right body front frames. The frame is detachably connected via a bracket, the lower part of the front side of the bracket supports the lower link for connecting the working device, and the upper part of the front side of the bracket supports the top link for connecting the working device. A hydraulic cylinder for swinging the link up and down is supported by the bracket.

[0005]

When the present invention is constructed as shown in FIG.
As shown in, the front surface of the front PTO case 2 is located closer to the inside of the vehicle than the front ends of the left and right vehicle front frames 3 (the front ends of the frames 13), and the front PTO case 2 is located on the left and right vehicle front frames 3 Therefore, the front PTO case 2 does not protrude forward or leftward or rightward from the front end of the vehicle body front frame 3.

The bracket 4 connecting the front PTO case 2 to the body front frame 3 is connected to the top link 6 and the lower link 5 and the top link 6 for connecting the working device.
A hydraulic cylinder 7 for swinging up and down is supported. As a result, the bracket for the front PTO case is also used as the bracket for the top link and the like, so that a dedicated bracket for connecting the top link and the like to the body front frame is not required. Then, for example, as shown in FIG. 8, the front PTO case 2, the bracket 4, the top link 6, the lower link 5 and the hydraulic cylinder 7 are formed into a single unit. It can be attached to and detached from the frame 3.

[0007]

As described above, by connecting the front PTO case to the inside of the body with respect to the front frame of the body and supporting it so that it does not project outward, the front PTO case becomes ridged when turning. It was possible to prevent the state of contact and to improve the turning performance of the agricultural tractor. Further, the top link, the lower link, and the bracket dedicated to the hydraulic cylinder can be omitted, the structure can be simplified and the cost can be reduced, and the front PTO case, the top link, etc. can be configured in a unit. Since it can be attached / detached to / from the aircraft front frame as a unit, the operability of attachment / detachment to / from the aircraft front frame can be improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. (1) As shown in FIG. 1 and FIG. 2, an agricultural tractor is constructed by providing an engine 15 at the front part of a machine body supported by front wheels 8 and rear wheels 9, a mission case 16 at the rear part, and a control part 17 at the center. ing. As shown in FIGS. 2 and 3, a front PT including a front PTO shaft 1 protruding toward the front side of the body
The O case 2 is connected to the body front frame 3.
Power from the output shaft 18 (see FIG. 9) facing forward of the engine 15 is transmitted to the transmission shaft 20 having the universal joint portion.
Via the input shaft 28 of the front PTO case 2 (see FIG.
And FIG. 8), the power from the engine 15 is transmitted to the front PTO shaft 1 and a wet multi-plate clutch (not shown) capable of performing transmission interruption can be used.
It is installed in Case 2.

As shown in FIGS. 9 and 2, a pulley 21 is connected to an output shaft 18 of an engine 15 by a spline structure and a bolt 22, and a spline shaft 43 is connected to the bolt 2.
It is connected to the pulley 21 by 3. The transmission belt 27 is wound around the input pulley 26 and the pulley 21 of the fan 25 for the radiator 24.

(2) Next, the connecting structure of the front PTO case 2 to the body front frame 3 will be described. As shown in FIGS. 3, 4 and 7, a pair of left and right brackets 4 for the front PTO case 2 are provided.
Each of the left and right side surfaces of the case 2 is connected to each of the left and right brackets 4 by a pair of left and right bolts 12. A support bracket 14 for a hydraulic cylinder 7, which will be described later, is fixed to the lower part of one of the brackets 4, and a bottom plate 29 is bolted to the bottoms of the left and right brackets 4. The front surface of the lower portion is abutted against the inner side of the support bracket 14 inside the body, and the front PTO case 2 is secured by one bolt 30.
Is connected to the bottom plate 29.

As shown in FIG. 8, a frame 13 formed by bending a plate material into a box shape is connected to both front ends of the left and right body front frames 3 and is connected to the frame 13.
A bracket 31 is bolted to the front side surface of the. Then, in the front PTO case 2 and the left and right brackets 4 which are one unit, as shown in FIGS.
As shown in FIG. 5, the upper part of the front PTO case 2 is inserted into the inside of the frame 13 toward the inside of the body, and the brackets 4 are attached to the lateral side surfaces of the frame 13 in a detachable manner. Further, in the bracket 4, a support portion 4a for a top link 6 described later is bolted to the bracket 31.

As a result, as shown in FIGS. 3 and 4,
The left and right side surfaces of the front PTO case 2 are connected to the left and right brackets 4 by a pair of left and right bolts 12. The upper front surface of the front PTO case 2 is a frame 13 above the bolts 12. The front side of the lower part of the front PTO case 2 is abutted against the inner side of the body of the support bracket 14 below the bolts 12.
The O case 2 is fixed. The front surface of the front PTO case 2 is located closer to the inside of the aircraft than the front ends of the left and right airframe front frames 3 (the front ends of the frames 13), and the front PTO case 2 is located on the left and right airframe front frames 3. It will be located in between.

(3) Next, the top link 6, the lower link 5, the hydraulic cylinder 7 and the like supported by the bracket 4 will be described. As shown in FIGS. 3, 4, 7, and 8, the support brackets 32 are fixed to the lower outer surfaces of the left and right brackets 4, and the support brackets 14 are fixed to the lower inner surface of one of the brackets 4. Then, one pin 33 is inserted into the support brackets 14 and 32 of the one bracket 4, and the lower link 5 and the hydraulic cylinder 7 are swingably supported by the pin 33, while the other bracket 4 is supported. The lower link 5 is swingably supported by the bracket 32 via a pin 33.

A support portion 4a integrally extends upward from the front portions of the left and right brackets 4 to support the support portion 4 as described above.
a is bolted to the bracket 31. And
The box-shaped top link 6 is supported by the pins 34 on the left and right support portions 4
The hydraulic cylinder 7 is swingably supported by a and is connected to the top link 6.
An A-type frame 35 is connected across the lower links 5.

With the above structure, a working device (not shown) is connected to the A-shaped frame 35, and power is transmitted from the front PTO shaft 1 of the front PTO case 2 to this working device. Raise and lower the work equipment. Then, as shown in FIG. 8, the front PTO case 2, the pair of left and right brackets 4, the top link 6, the pair of left and right lower links 5, the hydraulic cylinder 7, and the A-type frame 35 are formed into one unit. This unit can be attached to and detached from the machine body front frame 3 as described above.

(4) As shown by the chain double-dashed line in FIG. 1, the mower 10 is configured to be supported between the front wheel 8 and the rear wheel 9 via the link 51. The link 11 to be connected is configured to be connectable to the bracket 4. Next, the structure for supporting the link 11 for the mower 10 in the bracket 4 will be described. As shown in FIGS. 6 and 7, one operating shaft 36 is rotatably supported across the lower portions of the left and right brackets 4, and the operating shaft 3 is
The operation lever 36a is fixed to one end of the bracket 6, and a pair of left and right hook members 37 is fixed to the operation shaft 36 in the inner portion of the left and right brackets 4. One bracket 4
A lock pin 38 is supported on the left and right sides of FIG. This lock pin 38 is a spring 39
The support bracket 45 having a notch that is urged toward the protruding side (left side of the paper surface of FIG. 6) by pulling out and holds the lock pin 38 to the right side of the paper surface of FIG. 6 is fixed to the bracket 4. ing.

With the above structure, as shown in FIGS. 6 and 5A, the left and right hook members 3 are operated by the operating lever 36a.
By operating 7 downward, the rod 40 connected to the pair of left and right links 11 is hooked on the left and right hook members 37. Next, as shown in FIG. 5B, the left and right hook members 37 are operated upward by the operation lever 36a to move the lock pin 38 to the lock hole 37a of one hook member 37.
(See FIG. 5 (A)), and insert the left and right hook members 37.
To fix. Then, the link 11 can be removed from the hook member 37 by performing the operation opposite to the above.

(5) As shown by the chain double-dashed line in FIG. 1, the front loader device 41 can be connected to the front part of this agricultural tractor. In this case, as shown in FIGS. 1, 2, and 8, a pair of brackets 42b are fixed to the left and right of a support plate 42a formed by bending a flat plate in an upwardly open shape, and the support portion 4 is formed.
2, the bracket 42b of the support portion 42 is jointed together with the bracket 4 for the front PTO case 2 to the lateral side surface of the frame 13 by bolts.
With this structure, as shown in FIG. 1, the horizontal frame 41a of the front loader device 41 is placed on the support plate 42a to connect the front loader device 41. In this case, the top link 6 and the A-shaped frame 3 are connected by the hydraulic cylinder 7.
Even if 5 is raised to the upper limit, they do not come into contact with the front loader device 41.

[Other Embodiments] Instead of the structure shown in FIG. 9, the structure shown in FIG. 10 may be used. As shown in FIG. 10, in the spline shaft 43, the screw portion 4 is provided at the right end of the drawing.
3a is formed, and the flange 4 is formed on the outer peripheral portion of the spline shaft 43.
4 is fixed. As a result, the pulley 21 is externally fitted to the output shaft 18 of the engine 15 by the spline structure, the screw portion 43a of the spline shaft 43 is screwed into the output shaft 18, and the flange 44 is connected to the pulley 21 by the bolt 23.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

1] Overall side view of an agricultural tractor

FIG. 2 is a side view of the front PTO case and the vicinity of the engine.

FIG. 3 is a vertical sectional side view near the front PTO case.

FIG. 4 is a vertical sectional front view near the front PTO case.

FIG. 5 is a side view in the vicinity of a connecting portion of a link (for connecting mowers between front and rear wheels) in a bracket for a front PTO case.

FIG. 6 is a front view of the vicinity of a connecting portion of a link (for connecting mowers between front and rear wheels) in a bracket for a front PTO case.

FIG. 7 is an exploded perspective view of a front PTO case, a bracket, a top link, a lower link, a hydraulic cylinder, an A-type frame and the like.

FIG. 8 is a perspective view of a unit-shaped front PTO case, a fuselage front frame, and a support portion for a front loader device.

FIG. 9 is a vertical cross-sectional side view near the output shaft of the engine.

FIG. 10 is a vertical sectional side view in the vicinity of an output shaft of an engine according to another embodiment.

[Explanation of symbols]

 1 Front PTO Axis 2 Front PTO Case 3 Airframe Front Frame 4 Bracket 5 Lower Link 6 Top Link 7 Hydraulic Cylinder

Claims (1)

[Claims] 1. A front PTO case (2) provided with a front PTO shaft (1) projecting to the front side of an airframe, wherein a front surface of the front PTO case (2) is a front end of a pair of left and right airframe front frames (3). A bracket (4) is provided on a portion of the fuselage front frame (3) that is located on the inner side of the fuselage and the front PTO case (2) is located between the left and right fuselage front frames (3). ), The lower link (5) for connecting the working device is supported on the lower front side of the bracket (4), and the top link for connecting the working device is mounted on the upper front side of the bracket (4). A front PTO case support structure for an agricultural tractor in which a hydraulic cylinder (7) that supports (6) and swings the top link (6) up and down is supported by the bracket (4).