JPH0442966Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] This invention relates to a lift rod shared device used for rolling control that controls the lateral inclination of a ground work machine such as a rotary tiller to a set value regardless of the lateral inclination of the tractor.
We propose a device that is devised so that a lift rod can be used in common with both 2P and 3P connection devices. [Prior Art] When performing rolling control, in order to use a ground work machine 2 such as a rotary tiller for a so-called 2P coupling device 1 whose side view is shown in FIG.
The hit parts 6a and 7a of the left and right connecting arms 6 and 7 of the ground work machine 2 are connected to the left and right hit pins 5 and 5 of the bracket 4 attached to the rear of the tractor 3, and the machine is raised and lowered by a lift cylinder of a hydraulic lifting mechanism. The rotating left and right lift arms 8, 9 and connecting arms 6, 7 are connected to each other by left and right lift rods 10, 11, respectively. In the illustrated example, the left lift rod 10 is connected to a lift rod cylinder 10a and its The bracket 4 is formed into a telescopic member consisting of a lift rod piston 10b, and a rotation surface P is formed around a rotation center C that is located in the left-right direction and extends in the front-rear direction. hittipin 5,5 for 4a
Since the hit pin portion 4b on the side is configured to be able to swing and rotate around the rotation center C, the ground work machine 2 moves around the rotation center C as the lift rod piston 10b moves in and out. It is configured so that the left and right posture can be adjusted. On the other hand, the so-called
To use the ground work device 13 (rotary tiller or burau) for the 3P coupling device 12, connect the left and right center portions of the bracket 14 attached to the rear of the tractor 3 and the mast 15 of the ground work device 13 to the top link 16. and connect the rear lower left and right hit parts 3a, 3a of the tractor 3 and the left and right lower parts of the ground work equipment 13,
Connected by left and right lower links 17, 18, left and right lift arms 8, 9 and lower links 17, 18
For example, lift rod 19 that can be extended and retracted on the left side
The right sides are connected to each other by a non-extendable lift rod 20, and by extending and retracting the lift rod 19, the lateral attitude of the ground work equipment 13 is adjusted. However, unlike the lift rods 10 and 11 used in the case of the 2P coupling device 1, the 3P coupling device 1
Since the lift rods 19 and 20 used in 2 are required to be quite long, conventionally
It is necessary to have separate lift rods for the 2P coupling device 1 and the 3P coupling device 12, and in addition, as will be described later, a method using a lift rod sensor to measure the length of the lift cylinder is required for rolling control. In this case, it is also necessary to prepare a lift rod sensor suitable for each measurement length.
Not only does this increase costs, but it is extremely troublesome for the user, such as losing unused parts during storage. Therefore, in view of the above-mentioned deficiencies, the applicant of the present application proposed a lift rod device described in Japanese Patent Application Laid-open No. 12902/1983 in order to overcome the above-mentioned deficiencies. The lift rod device described in the same publication has a female threaded part provided in the hollow part of the piston rod, and another rod having a male threaded part that is screwed into this female threaded part is screwed into the female threaded part. .

[Problem that the idea aims to solve]

The lift rod device described in the above publication has a complicated structure and is difficult to process.Furthermore, in order to ensure durability, the diameter of the lift rod piston must be increased, resulting in high cost and the need for 2P.
The operation when changing from normal to 3P is extremely troublesome. Therefore, the technology that should be solved in order to obtain a lift rod common device for rolling control that is strong, can contribute to cost reduction, and is easy to operate when changing from 2P to 3P. This problem arises, and the purpose of the present invention is to solve this problem.

[Means to solve the problem]

This invention was proposed to achieve the above-mentioned purpose, and it connects one side of the left and right connecting arms of the ground work equipment, which is connected to the tractor so that it can swing around an axis in the longitudinal direction, and the tractor. Rolling control of another type of ground work equipment that is connected to a tractor via left and right lower links to a lift rod piston of a lift rod cylinder that is extendable and retractable to connect the same sides of the left and right lift arms of the tractor. In a lift rod shared device configured such that an extension connection body that pivots the lower part of the lower link on the telescopic side can be removably attached for use, the front and rear extension connection units are made of two symmetrical plates. , on the other hand, a link ball is attached to the end of the lift rod piston, the two plates are arranged facing each other so as to sandwich the link ball, and a connecting pin passes through the link ball. etc., to connect the two oppositely arranged plates, one end of the two plates is attached to the lower link, and the other end is configured to be able to be locked to the lift rod piston. It is an object of the present invention to provide a lift rod shared device for rolling control characterized by the following features.

[Example and action]

An embodiment of this invention will be described below in detail with reference to the accompanying drawings. For convenience of explanation, conventionally known technical matters will also be explained at the same time. In the first embodiment, which is shown in a front view in FIG. 3A and in a side view in FIG. At the same time, the other end can be connected to a sensor rod pin 22 fixed to the lift rod piston 10b, and the intermediate portion is formed into an extension connecting body 24 connected to a connecting pin 23. That is, the tip 1 of the lift rod piston 10b
The link ball 30 is rotatably fitted into the link ball 30 and the link pin 23 is a single unit.
The connecting arm 6 of the above-mentioned ground work machine 2 is fitted to the left and right outer parts of the link ball 30, and the sensor pipe 25a of the lift rod sensor 25 consisting of a linearly moving potentiometer is connected to the lift rod. Also, the sensor rod 25 is attached to the cylinder 10a.
b are attached to the sensor rod pins 22, respectively, and the left and right inclination of the ground work equipment 2 is detected by, for example, a bubble moving type left and right inclination sensor S attached to the hitch pin part 4b. The length of the lift rod 10 is calculated in the control circuit so that the detected horizontal inclination value matches the horizontal inclination set value specified by the setting device, and the detected length by the lift rod sensor 25 is adjusted to the calculated length. The lift rod piston 10b is automatically controlled to move in and out so that the lengths match. To connect the ground work machine 13 with the 3P connecting device 12 illustrated in FIG. 2, the sensor rod 22 and the connecting pin 2 are connected as shown in FIG.
3, attach the plates 21, 21 to the extension connecting body 24.
As a result, the lower link 17 can be inserted into the pin hole 21a and connected by the connecting pin 26. Next, the extension connector 27 of another embodiment is shown in FIG. 4A as a front view and in FIG. 4B as a side view.
The lift rod sensor 25 is suitable for being attached to the lift rod 10 (in this case, the sensor is directly bridged between the lift arm 8 and the lower link 17), and One end of the two plates 28, 29 is provided with pin holes 28a, 29a for the lower link 17, and the other end is provided with clamping edges 28b, 29b that can clamp the lift rod piston 10b from the outside. When the plates 28 and 29 are pulled together and connected by the connecting pin 23, the clamping edges 28b and 29b are pressed against the lift rod piston 10b, and the plates 28 and 2
This means that the shape can be maintained so that the lower link 17 can be inserted into one end of the lower link 9. In addition to the above-mentioned embodiments, the extension connecting body may have various shapes that can be attached to the lift rod piston 10b and the connecting pin 23. [Effects of the invention] As detailed in the above-mentioned embodiment, this invention has the following effects:
Two symmetrical plates are arranged opposite to each other so as to sandwich a link ball attached to the end of the lift rod piston, and a connecting pin or the like passing through the link ball is used to connect the two symmetrical plates to each other. 2
In addition to connecting the two plates, one end of the two plates is attached to the lower link, and the other end is configured to be locked to the lift rod piston, making the installation operation easy. From 2P to 3P
It can be changed for various purposes, has great strength, and can contribute to cost reduction.

[Brief explanation of the drawing]

The figures show an embodiment of this invention. Figures 1 and 2 are side views of the main parts of each ground work machine in the connected state, and Figures 3A and 4A are views of the respective extension connectors. 4A is a front view of the lift rod using the embodiment, B is a side view of the corresponding one in FIG. 4A, and FIG. Description of symbols 2, 13... Ground work equipment, 3... Tractor, 6, 7... Connecting arm, 8, 9... Lift arm, 10a... Lift rod cylinder, 10b...
...lift rod piston, 17,18...lower link, 24,27...extension connection.

Claims (1)

[Scope of utility model registration request] It is extendable and retractable to connect one side of the left and right connecting arms of the ground work equipment, which is connected to the tractor so as to be able to swing and rotate about an axis in the longitudinal direction, and the same side of the left and right lift arms of the tractor. An extension connection body whose lower part is pivoted to the lower link on the telescopic side for rolling control of another type of ground work equipment that is connected to the lift rod piston of the lift rod cylinder and the tractor via the left and right lower links. In the lift rod shared device configured to be able to be detachably attached, the extension connecting body has two parts.
On the other hand, a link ball is attached to the end of the lift rod piston, and the two plates are arranged facing each other so as to sandwich the link ball. The two opposing plates are connected by a connecting pin or the like that passes through them, and one end of the two plates is attached to the lower link, and the other end is attached to the lift rod piston. A lift rod shared device for rolling control, characterized in that it is configured to be lockable.