JPH0154002B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for attaching a working device to an agricultural tractor used for various types of ground work such as plowing, plowing, and soil cultivation.

There are two types of working devices for agricultural tractors: those that are attached via a two-point linkage mechanism and those that are attached via a three-point linkage mechanism. It is desirable to be able to selectively and roll the device.

To do this, we need a two-point link bracket that is rotatable around the front and rear axis and to which the lower link of the two-point link mechanism can be attached, and a three-point link bracket for the pair of left and right lower links in the three-point link mechanism. It is necessary to install a fulcrum pin mounting bracket, and in the past, the structure was such that both types of brackets could be selectively installed and used.
This is because if a general standard specification link mechanism is used instead of a special one, the two types of brackets cannot be installed without mutual interference due to their position, or even if they are installed, This is because the rolling and lifting movements of the link mechanism are interfered with by the other bracket.

Therefore, in conventional agricultural tractors, replacing both types of working devices requires time and effort such as replacing the brackets, making the task of replacing both types of working devices troublesome and inefficient. Since the bracket is removable, it not only complicates the mounting structure, but also has the disadvantage that the mounting strength of the bracket is often unstable, such as insufficient tightening of the mounting bolt.

The present invention has an object to overcome such conventional drawbacks.

The characteristic structure of the working equipment mounting part structure of the agricultural tractor according to the present invention, which was taken to achieve the above object, is that the mounting bracket of the lower link in the two-point link mechanism for mounting the working equipment is attached to the rear end of the machine around the front and rear axis. The fulcrum pins of the pair of left and right lower links in the three-point linkage mechanism for mounting the working device are attached at the rear of the machine and at the outer positions of the left and right sides of the mounting bracket, respectively. The mounting bracket is provided in a state that allows rotation of the mounting bracket, and the pair of fulcrum pin mounting brackets are fixedly connected via a member located below the mounting bracket.

In other words, if the mounting position of the fulcrum pin mounting bracket shifts back and forth or up and down, if the three-point linkage mechanism of the general standard specifications is installed as is, the posture and position of the work equipment relative to the machine will change significantly. This will have a great negative effect on lifting control and rolling control, making it extremely difficult or impossible to perform the intended work properly and reliably, but if the mounting position of the fulcrum pin mounting bracket is slightly shifted laterally. However, focusing on the fact that there was no difference in the work, we installed it with both types of brackets by increasing the distance between the left and right pair of fulcrum pin mounting brackets, but there was no mutual interference between the two types of brackets. and both fulcrums due to the fact that the interference between the two types of brackets in the link mechanism is eliminated, and the left and right fulcrum pin mounting brackets are fixedly connected via a fixed connection member, thereby increasing the distance between the fulcrum pin mounting brackets. This prevents the mounting strength of the pin mounting bracket from decreasing.

The operation of the present invention having the above characteristic configuration is as follows.

Both types of link mechanisms can be selectively installed without modifying the general standard specifications, and both types of mounting brackets can be permanently installed on the machine.

Therefore, it is possible to selectively mount both types of working devices quickly, reliably, and powerfully with less effort through a link mechanism of general standard specifications.

Hereinafter, embodiments of the configuration of the present invention will be described based on the drawings.

As shown in FIG. 1, a first state in which the working device 2 is pulled up and down and rolled freely via a two-point link mechanism 1 equipped with a lower link 1A, and as shown in FIG. 2, a pair of left and right lower links 1A',
1A' and a top link 1B', the working device 2' can be freely switched to a second state in which it is pulled up and down as well as in a rolling manner. 3, 3 to the working device 2, and in the second state, to the lower link pair 1A', 1A' via the lift rod pair 3', 3' for lifting and lowering the pair of left and right working devices. This is an agricultural tractor having lift arms 4, 4 and a single-acting hydraulic cylinder 5 for forcibly raising these arms, and the working device mounting portion is configured as follows.

A bracket 6 to which the front end of the lower link 1A of the two-point linkage mechanism 1 can be attached to the rear end of the transmission case A1 for configuration A of this machine so as to be swingable around the horizontal axis X is attached to the transmission case A1. While being rotatably mounted around the axis a (an example of the front-rear axis) of the power take-off shaft 7 that protrudes rearward from A1,
The front ends of the lower links 1A', 1A' of the three-point link mechanism 1' are connected to ball joints 8 at the rear of the transmission case A1 and at the outer positions of both the right and left sides of the two-point link mounting bracket 6, respectively. ，
fulcrum pins 9, 9 that can be pivotally supported via 8;
The mounting brackets 10, 10 having the two-point link mounting bracket 6 are mounted in a state that allows rotation of the two-point link mounting bracket 6, and the pair of three-point link mounting brackets 10, 10 are attached to the two-point link mounting bracket 6. A top link is provided with a member 11 fixedly connected at a lower position thereof, and the front end of the top link 1B' of the three-point link mechanism 1' can be attached to the rear end surface of the transmission case A1 in a vertically swingable manner. It is constructed by attaching a bracket 12.

The two-point link bracket 6 includes a member 6A having a pair of left and right link pin attachment portions 6a, 6a.
and a member 6B which is fixed to the rear end face of the transmission case A1 and holds the member 6A rotatably around the longitudinal axis a.

The three-point link mounting bracket 10, 10
are attached to the left and right side surfaces of the transmission case A1 via bolts 13.

The fixed connecting member 11 is connected to the three-point link mounting brackets 10, 10 through bolts 14, 14, .
A towing hitch 16, which was to be connected via pins 17, is attached via pins 17.

The top link bracket 12 is provided with a plurality of pin insertion holes 12a vertically spaced apart from each other for a pivot connection pin with the top link 1B' in order to change the mounting position of the front end of the top link 1B' vertically. ing.

The means for rolling the working device 2 pulled through the two-point linkage mechanism 1 and the means for rolling the working device 2' pulled through the three-point linkage mechanism 1' include a pair of left and right lift rods 3, 3' is expanded and contracted by hydraulic cylinders 18, 18'.

Reference numeral 19 denotes a hook on the machine A' side for hooking the steady rest chains of the lower links 1A' and 1A' in the three-point linkage mechanism 1'.

Note that the present invention may be implemented by configuring the lift rod pair to be used for both the two-point link mechanism 1 and the three-point link mechanism 1'.

[Brief explanation of drawings]

The drawings show an embodiment of the structure for attaching a working device of an agricultural tractor according to the present invention, and FIG. 1 is a side view of the main part showing the working device attached via a two-point link mechanism, and FIG. FIG. 3 is a perspective view of the main parts, FIG. 4 is an enlarged side view of the main parts, and FIG.
The figure is an enlarged rear view of the main part, and FIG. 6 is an exploded perspective view of the main part. A... This machine, 1... Two-point link mechanism, 1A...
Lower link, 6...Mounting bracket, 1'...
Three-point link mechanism, 1A', 1A'...lower link,
10... Fulcrum pin mounting bracket, 11... Fixed connection member.

Claims (1)

[Claims] 1. At the rear end of the machine A, a mounting bracket 6 for the lower link 1A of the two-point linkage mechanism 1 for attaching a working device is attached so as to be rotatable around the longitudinal axis a, At the rear of the machine A and at the outer positions of the left and right sides of the mounting bracket 6,
The fulcrum pin mounting brackets 10, 10 of the pair of left and right lower links 1A', 1A' in the three-point linkage mechanism 1' for mounting work equipment are provided in a state that allows rotation of the mounting bracket 6, and A working device mounting structure for an agricultural tractor in which fulcrum pin mounting brackets 10, 10 are fixedly connected via a member 11 located below the mounting bracket 6. 2. The working device attachment structure for an agricultural tractor according to claim 1, wherein the fixed connection member 11 also serves as an attachment portion for a towing hitch 16.