JPS6231471Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to an improvement in the means for attaching and detaching a front loader to an agricultural tractor, which allows the lift arm of the front loader and the side frame, which is a supporting member of the lift arm, to be attached and detached as one unit. It is.

Prior Art Regarding the above-mentioned attachment/detachment means, we have previously applied for a utility model registration as a ``front loader attachment/detachment device for agricultural tractors'' (Kokoku Publication No. 60-29502). In the above application, as this attachment/detachment means, a boss with a pin hole is fixed on the tractor side in front of the front wheel bearing stand at the front of the tractor, into which a fixing pin for connecting the side frame and the tractor is inserted. A front bracket was provided on the side surface of the clutch housing approximately in the center of the front and rear axles (or on the portion extending from the side surface of the clutch housing to the lower part of the rear axle), and was provided with a rear bracket that supported the axle lug at the rear of the side frame.

At the position corresponding to this attachment/detachment means on the tractor side,
On the side frame side, there is also a pin hole for the boss of the front bracket at the tip as a means for attaching and detaching.
It was provided with a pin hole into which a fixing pin was inserted and a guide member which guided the boss. In addition, the aforementioned shaft lug was provided at the rear.

For this reason, the front bracket, which is one of the supporting members of the front loader, is provided in front of the front vehicle bearing stand, resulting in the following problems.

(1) Since external force is received at the front end of the front axle bearing pedestal, bending stress is applied using the front axle as a fulcrum, and as a result, a large external force is concentrated at the joint between the front axle bearing pedestal and the engine. Therefore, if the tractor strength is insufficient, the tractor may be damaged.

(2) In order to reinforce the tractor, reinforcing members are provided across the front and rear sides of the bonnet, which not only makes it difficult to open and close the side covers of the bonnet and impede maintenance, but also deteriorates visibility in front of the front wheels and the tractor.

(3) In order to reduce the force applied to the joint between the front axle bearing stand and the engine, if the attachment/detachment means including the front guide member on the side frame side is arranged above the front axle, which is the fulcrum of external force, The attachment/detachment means on the frame side has become quite bulky,
When the front wheel swings or when the handlebar is tightened, the front wheel of the front attachment/detachment means comes into contact with the front wheel. For this reason, the sharpness angle and swing angle must be regulated, which has the disadvantage of deteriorating the operability of the tractor.

Means for Solving the Problems The purpose of this invention is to solve the above-mentioned drawbacks, and its gist is as follows.

That is, the tractor has a guide ear shaft at the front,
A boss with a pin hole is provided above the front wheel bearing stand,
The side frame has a guide member at its tip that guides the guide shaft lug when the front loader is attached or detached, and a pin that connects and inserts a fixing pin into the pin hole at a position corresponding to the boss when the front loader is attached. In addition to providing a hole, a rear bracket is provided to support the shaft lug provided at the rear of the side frame.

Function: By providing a guide shaft lug on the front of the tractor and a boss for connecting the side frame above the front wheel bearing stand of the tractor, the guide member on the side frame side can be downsized, and the front wheel bearing stand can be made smaller. The bending moment experienced by the material can be minimized.

Effects As a result of positioning the boss for connecting the side frame above the front vehicle bearing stand, there is no problem in mounting the front loader even if the bending strength of the tractor is relatively small. Therefore, even if it is necessary to reinforce the tractor, the reinforcing member can be relatively small, and the side frame, which is not directly subjected to external force, can be made small, so the opening and closing of the side cover is not obstructed and maintenance is easy. Also, it does not obstruct the front view when operating the front wheels or disengaging the front loader.

Further, since the guide shaft lug and support member can be made smaller, forward visibility and operability are improved.

Embodiments Hereinafter, this invention will be explained in detail based on illustrated embodiments.

F is an agricultural front loader, which includes a pair of left and right lift arms 1, left and right side frames 2 that support them, attachments such as buckets that are detachably attached to the tip of the lift arms 1, and a lift cylinder for raising and lowering the lift arms. , a dump cylinder for operating the attachment, etc.

Reference numeral 3 denotes a side arm of the side frame 2, and a front portion 4 is provided obliquely downward in the front direction. A U-shaped guide member 5 that opens upward is fixedly provided inside the tip of the front portion 4 .

6 is a boss which has a pin hole 7 for inserting a fixing pin, which will be described later, in order to fix the side frame 2 to the tractor T, and when the front loader F is attached to the tractor T, the front wheel bearing of the tractor It is fixed to the lower part of the side arm 3 via a support plate 8 at a position where it is supported above the table.

Reference numeral 9 denotes a shaft lug, which is provided protruding from the side of a support plate 10 fixed to the lower part of the rear part of the side frame 2.

Next, on a front bracket 11 projecting from the front of the tractor T, a guide shaft lug 12 is fixedly provided, which serves as a guide means on the tractor side when the front loader F is attached or detached. A boss 13 has a pin hole 14 for inserting a fixing pin, and is fixedly installed above the front wheel bearing stand of the tractor T via a mounting plate 15 and a support plate 16.

Reference numeral 17 denotes a rear bracket, which has a substantially U-shaped recessed part that removably locks the shaft lug 9 on the front loader 1 side, and is fixed to the side of the clutch housing of the tractor T via a support plate 18. It is set up.

In addition, 19 is a reinforcing bracket, and 20 is a fixing pin that is removably inserted into the pin hole 7 of the front loader side boss and the pin hole 14 of the tractor side boss to connect the two.

Reference numeral 21 denotes a centering member that guides the boss 13 on the tractor side when the front loader F is attached to and detached from the tractor T.

With such a configuration, the front loader F can be attached to and detached from the tractor T in the following manner.

First, the case where the front loader F attached to the tractor T as shown in FIG. 1 is detached will be explained.

(1) The plunger 23 of the lift cylinder 22 of the lift arm 1 is moved backward to lift the front wheels of the tractor T off the ground.

(2) Lower the stand 24.

(3) Remove the fixing pin 20.

(4) Move the plunger 23 forward and guide the ear shaft 1.
2 is removed from the guide member 5, the side frame 2 moves forward using the shaft lug 9 of the side frame that has moved forward through the recessed part of the rear bracket 17 as a fulcrum.
Rotate counterclockwise and the shaft ear 9 also connects to the rear bracket 1.
7 (see Figure 4). At this time, the boss 6 on the front loader side and the boss 13 on the tractor side
The stand 24 also separates and the stand 24 touches the ground.

(5) After separating the hydraulic piping from the front loader, move the tractor T backward.

To attach the front loader to the tractor, the steps described above may be reversed.

Note that this invention can also be implemented in a structure in which the front portions of the left and right side frames are rigidly connected, in a structure in which the side frames are directly connected to the ground without providing a stand, or in a structure in which the height of the stand is adjustable.

[Brief explanation of the drawing]

FIG. 1 is a front view of the front loader mounted on a tractor, FIG. 2 is a front view of the main parts of the front loader, and FIG. 3 is a front view of the main parts of the tractor.
Further, FIG. 4 is an explanatory view of the main parts when the front loader is detached. F...Front loader, T...Tractor, 1...
...Lift arm, 2...Side frame, 5...
Guide member, 6...Boss, 9...Shaft lug, 12...
Guide shaft ear, 13...boss, 17...rear bracket.

Claims (1)

[Scope of utility model registration request] In a front loader in which the lift arm is removably attached to the tractor integrally with the side frame of the support member, the tractor has a guide shaft lug at the front and a pin hole above the front wheel bearing stand. A guide member is provided at the tip of the side frame to guide the guide shaft lug when the front loader is attached or detached, and a fixing pin is connected to the pin hole at a position corresponding to the boss when the front loader is attached. A means for attaching and detaching a front loader to an agricultural tractor, characterized in that the tractor is provided with a boss having a pin hole into which the front loader is inserted, and a rear bracket is provided on the tractor to support a shaft lug provided at the rear of a side frame.