JPS6216806Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a single top link spindle and a pair of left and right lower links connected to the upper part of the machine frame of the tractor body, and a pair of left and right lift arms that rotate integrally. The object of the present invention is to provide a mounting structure for a drive link mechanism for lifting and lowering a working device in an agricultural tractor, in which the shafts to be connected are supported in parallel positions at intervals vertically, and the lift arm shaft is interlocked and connected to one end of a drive cylinder. The object of the present invention is to make it possible to mount the top link support shaft, lift arm shaft and cylinder in a simple and compact manner, and also to facilitate their assembly work.

First, an embodiment of the present invention will be described based on the drawings.

As shown in FIG. 1, a differential case 4 for a pair of left and right front wheels 3 is attached to a frame 2 that is fixedly connected to an engine 1 and has an inverted U-shape or a nearly inverted U-shape when viewed from above. A tractor body A that is connected and supported so as to be able to swing up and down within a certain range around it.
At the front of the frame (hereinafter referred to as front wheel support frame) 2, one top link 5, a pair of left and right lower links 6, 6, and lift rods 7, 7 are attached to the lower links 6, 6. A drive link mechanism 10 for lifting and lowering the work equipment is provided, which is comprised of lift arms 8, 8, which are pivotally connected through the lift arms 8, and a hydraulic cylinder 9 for driving and swinging both the lift arms 8, 8 in the vertical direction. In an agricultural tractor, a power extraction structure for a working device is constructed as follows.

That is, as shown in FIGS. 2 to 5, a U-shaped frame 11 that projects downward from the front wheel support frame 2 and has a forward opening in plan view is fixedly connected to the front end of the front wheel support frame 2. , this U-shaped frame body 1
1, a first power take-off shaft 12 that projects only toward the front of the machine body and a second power take-off shaft 12' that projects on both sides in the longitudinal direction of the machine body are rotatably supported, and both shafts 12, 12' A gear case 14 housing a gear type transmission mechanism 13 for interlocking the engine 1 is fixedly connected to the gear case 14 so as to be reversible up and down. output shaft 1
A belt transmission device 18, which also serves as a working clutch, is provided between the drive shaft 17 connected to the drive shaft 17 via a coupling ring 16, and the drive shaft 17 and the belt transmission device 18 fixed thereto. A portion of the drive pulley 19 is inserted into the front wheel support frame 2 when viewed from the side.

Further, the U-shaped frame 11 of the gear case 14
By reversing and replacing the transmission mechanism 13
One of the power take-off shafts 12 or 12' located below has a gear ratio of
is in a low speed drive state (for example, 722 RPM suitable for snob blower work), and the other power take-off shaft 12' is in a high speed drive state (for example, 722 RPM suitable for mower work).
2300RPM).

To explain in detail the structure of the bearing portion of the drive shaft 17, a reinforcing frame 20 is fixed to the lower surface of the reinforcing frame 20 between the opposing side plate portions 2A, 2A of the front wheel support frame 2, and protrudes further forward than the reinforcing frame 20. A bearing member 23 that supports the drive shaft 17 via a bearing 22 is placed on the protruding portion of the plate member 21. The tongue piece 23A extending downward through the notch 21a formed in the member 21 is attached to the U-shaped frame 11.
It is fixedly connected to a bracket 24 which is fixed to the.

Further, the front wheel support frame 2 and the bearing member 2
3, a cover 25 covering the upper side of the drive pulley 19 is attached, and a front side of the input pulley 26 of the belt transmission device 18 is attached to the front surface of the connecting plate portion 11A of the U-shaped frame 11. A cover 27 covering the three crank-shaped brackets 2
It is attached via 8...

The belt transmission device 18 is connected to both the pulleys 1
Transmission belt 29 wrapped around between 9 and 26
On the other hand, by swinging the tension arm 30 in the distance direction, the power transmission from the drive shaft 17 to the power take-off shaft 12' or 12 is interrupted.

Next, the mounting structure of the elevating link mechanism 10 will be explained.

That is, on the left and right positions of the front end surface of the front wheel support frame 2, each has a U-shape or almost a U-shape when viewed from above,
And those outer plate portions 31 in front view
B, 31B fix diamond-shaped brackets 31, 31 that protrude upward from the upper ends of the inner plate portions 31A, 31A, and these left and right brackets 3
1, 31 opposing inner plate portions 31A, 31A
The support shaft 32 of the top link 5 is penetrated and supported between the outer plate portions 31B, 3.
1B, a shaft 33 that connects the lift arms 8, 8 in an integrally rotating state extends between the inner plate portions 31A, 31A, and a portion projecting upwardly from the inner plate portions 31A, and passes through the shaft 33 in a position parallel to the top link support shaft 32. support,
and the arm 3 fixed to the lift arm shaft 33.
The cylinder 9 pivotally connected to the inner and outer plate portions 31 of one bracket 31 when viewed from the front.
It is located between A and 31B.

Further, near the lower ends of the opposing side plate portions 11B, 11B of the U-shaped frame 11, the swinging shafts 35, 35 of the lower links 6, 6 are connected with nuts 36,
36, and a mounting bracket 37 for the cylinder 9 is fixed to the inner surface of the connecting plate portion 11A of the U-shaped frame 11.

The left and right brackets 31, 31 may be configured to have a rectangular shape when viewed from the front, and as shown in FIG. Axis 3
2 and a through hole 39 for the lift arm shaft 33,
The left and right brackets 31, 31 may be configured to have the same specifications by making the inner diameters of the bolts 40 and the positions of the bolt mounting holes 41 to the front wheel support frame 2 the same.

In summary, the mounting structure of the drive link mechanism for lifting and lowering the working equipment in the agricultural tractor according to the present invention is as follows. ,
The outer plate portions 31B, 31B are fixed to the brackets 31, 31 which protrude upwardly than the upper ends of the inner plate portions 31A, 31A, and the opposing inner plate portions 31 of the left and right brackets 31, 31
The support shaft 32 of the top link 5 is supported between the outer plate portions 31B and 31A.
31B, the lift arm shaft 33 is penetrated and supported between the inner plate portions 31A, a portion projecting upwardly from the upper end of 31A, and the cylinder 9 is connected to the inner and outer plates of one bracket 31 when viewed from the front. It is characterized by being located between portions 31A and 31B.

In other words, the inner and outer plate portions 31 of the U-shaped brackets 31, 31 fixed to the left and right positions of the machine frame 2
A, 31B and 31A, 31B, these side plate portions 31A, 31A and outer plate portion 31
The top link support shaft 32 extends between B and 31B.
By supporting the lift arm shaft 33 and the top link support shaft 32, for example, compared to the case where the left and right sides of the top link support shaft 32 and the lift arm shaft 33 are respectively supported by four brackets fixed to the machine frame 2 separately. Therefore, the number of parts to be installed and the number of assembly steps can be reduced.
By locating the cylinder 9 between the inner and outer plate portions 31A and 31B of one bracket 31 when viewed from the front, it is possible to not only eliminate the lateral and outer side protrusion of the cylinder 9, but also reduce the amount of forward protrusion. can be made as small as possible, and as a whole,
Both shafts 32, 33 and cylinder 9 can be mounted compactly by simplifying the structure. Moreover, the lift arm shaft 33 is connected to the inner plate portions 31B, 31A by the outer plate portions 31B, 31B.
Because the inner plate portions 31A,
31A does not impose restrictions on the assembly of the lift arm shaft 33, and in addition, as mentioned above, the number of assembly steps can be reduced, making the assembly work of each of the above members efficient and easy. I was able to do it.

Further, as in the above-mentioned embodiment, when the left and right brackets 31, 31 are configured with the same specifications, a combination such as a case where both the brackets 31, 31 are configured symmetrically is possible. There is no confusion during installation, and there is an advantage that the above-mentioned assembly work can be made more efficient and easier to assemble.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the mounting structure of the drive link mechanism for lifting and lowering the working equipment in an agricultural tractor according to the present invention, and FIG. 1 is an overall side view of the agricultural tractor, and FIG. 2 is an enlarged partially cutaway front view of the main part. Figure 3 is an enlarged plan view of the main part, Figure 4 is an enlarged longitudinal sectional side view of the main part, and Figure 5 is a sectional view taken along the line - in Fig. 4.
FIG. 6 is an enlarged front view of main parts showing another embodiment. A... Tractor body, 2... Machine frame, 5... Top link, 6... Lower link, 8... Lift arm, 9... Cylinder, 31... Bracket, 3
1A...Inner plate part, 31B...Outer plate part, 3
2... Top link support shaft, 33... Lift arm shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] At the upper part of the machine frame 2 of the tractor body A, there is a support shaft 32 of one top link 5, and a pair of left and right lift arms 8 linked to a pair of left and right lower links 6, 6. , 8 in an integrally rotating state.
The lift arm shaft 33 is supported by the drive cylinder 9 in a vertically spaced manner in a parallel position.
This is a mounting structure for a drive link mechanism for lifting and lowering a working device in an agricultural tractor which is interlocked and connected to one end of the machine frame 2, and has a U-shaped or almost U-shaped link mechanism on the left and right positions of the machine frame 2, respectively. The outer plate portions 31B, 31B are the inner plate portions 31A, 3
The brackets 31, 31 that protrude upward from the upper end of the left and right brackets 31, 31 are fixed, and the opposing inner plate portions 31A, 3 of the left and right brackets 31, 31 are fixed.
1A of the support shaft 32 of the top link 5.
, and the outer plate portions 31B, 3
1B, the lift arm shaft 33 is penetratingly supported between the inner plate portions 31A, 31A, and the portions projecting upward from the upper ends of the inner plate portions 31A, and the cylinder 9 is supported by one bracket 3 in a front view.
1. An attachment structure for a drive link mechanism for lifting and lowering a working device in an agricultural tractor, characterized in that the link mechanism is located between the inner and outer plate portions 31A and 31B of the agricultural tractor. The mounting structure for a drive link mechanism for lifting and lowering a working device in an agricultural tractor according to claim 1, wherein the left and right brackets 31, 31 are configured to have a rhombic shape when viewed from the front. The mounting structure for a drive link mechanism for lifting and lowering a working device in an agricultural tractor according to claim 1 or 2, wherein the left and right brackets 31, 31 are configured to have the same specifications.