KR101767164B1

KR101767164B1 - Loder Valve for Tractor

Info

Publication number: KR101767164B1
Application number: KR1020100137785A
Authority: KR
Inventors: 서진; 김장현
Original assignee: 대동공업주식회사
Priority date: 2010-12-29
Filing date: 2010-12-29
Publication date: 2017-08-10
Also published as: WO2012091485A3; WO2012091485A2; KR20120075890A

Abstract

The present invention relates to a tractor loader valve, comprising: a first and a second spool shaft provided in a tractor and operated by a lever operation and inserted into a valve housing; First and second support members inserted into the first and second spool shafts, respectively, the first and second support members being located inside the end cap, the end of which is coupled to the outside of the valve housing; And a spring portion which is seated inside the end cap and into which the first and second support members are inserted, the first and second spool shafts, A stopper is provided between the member and the end cap.

Description

{Loder Valve for Tractor}

The present invention relates to a tractor loader valve for restricting and using a specific function of a loader valve provided in a tractor.

In general, tractors can be used for a variety of purposes, such as cultivating rice fields and fields, crushing and plowing the soil.

The tractor may be equipped with a boom in front of the tractor, and a working machine having various shapes and structures may be installed according to the purpose of use.

1 and 2, the tractor T may be disposed in front of the tractor T with a loader C equipped with a boom B. [

The tractor (T) may be provided with a loader valve (1) on the vehicle body.

The loader valve 1 can be implemented with various functions of the loader by the lever 3 operated by a driver (not shown).

For example, there is a boom up function for raising and lowering the boom B, a boom down function, a roll-back function for loading or unloading the load on the bucket, A power dump function and a floating function in which the bucket is repeatedly operated up and down by a predetermined angle in order to planarize the workpiece using a bucket can be implemented .

The loader valve 1 thus operated is arranged between the lever 3 and the loader valve 1 in such a manner that the specific function of the loader valve 1 is not used depending on the type of the working machine mounted on the tractor T It is troublesome to separate the cable and cap assembly and the joint.

This is because the power dump or floating function may be unnecessary when a specific working machine is installed in the tractor and the power dump and floating function of the loader valve 1 may be performed when the working durability and the floating function cause the breakage of the working machine. Because it has to be adjusted to be unused.

To this end, the operator is required to use the accessory provided in the loader valve (1) or the entire assembly in a state of being replaced.

As a result, damage to the sealing part occurs due to the change of the accessory provided to the loader valve 1, or the position of the lever 3 is changed, and the position of the lever becomes unstable.

In addition, unnecessary time and expense required for the operator to replace a part of the loader valve 1 is consumed, and a technical countermeasure has been demanded.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tractor loader valve for preventing a failure of a tractor by adjusting a specific function to be inoperable when a working machine other than a bucket is installed.

In order to achieve the above object, a tractor loader valve according to the present invention comprises: a first and a second spool shaft provided in a tractor and inserted into a valve housing having a hydraulic line; First and second support members inserted into the first and second spool shafts, respectively, the first and second support members being located inside the end cap, the end of which is coupled to the outside of the valve housing; And a spring portion which is seated inside the end cap and into which the first and second support members are inserted, characterized in that in order to selectively restrict movement of the first and second spool shafts, A stopper for blocking the movement of the oil through the line may be provided.

The stopper may be disposed between the first and second support members and the end cap.

The stopper restricts the movement of the first and second spool shafts with respect to a predetermined section of the entire stroke in which the first and second spool shafts are operated.

As described above, the tractor loader valve according to the present invention has an effect that a part of the loader valve can be simply disassembled and used so as not to realize a specific operation.

The loader valve for a tractor according to the present invention minimizes the malfunction and failure of the loader valve, so that the convenience and cost of the loader valve can be reduced.

The tractor loader valve according to the present invention has an effect that unnecessary maintenance time for the loader valve is not generated.

1 and 2 show a conventional tractor and a loader valve.
3 is a perspective view showing a lever provided on a tractor;
4 is an exploded perspective view of the loader valve.
5 is a longitudinal sectional view of the loader valve shown in Fig.
6 is an exploded perspective view of a loader valve according to the present invention.
7 is a sectional view of the loader valve according to the present invention.
8 is an operational state diagram of a general loader valve.
9 to 10 are operational states of a loader valve according to the present invention.

Hereinafter, an embodiment of a tractor loader valve according to an embodiment of the present invention will be described with reference to the accompanying drawings.

The main configuration of the tractor loader valve will be described with reference to FIGS. 4 to 5 attached hereto.

The loader valve 1 is provided with a valve housing 10 and the first and second spool shafts 100 and 200 can be disposed inside the valve housing 10. The first and second spool shafts 100 and 200 And may have a plurality of grooves at different intervals along the longitudinal direction.

The first and second spool shafts 100 and 200 may have a joint 6 to which a connecting pin 7 is coupled. The joint 6 may be inserted into the upper ends of the first and second spool shafts 100 and 200.

The joint 6 can be coupled with the cable and cap assembly 5. The cable and cap assembly 5 may be coupled with a connecting cable 4 at an upper portion thereof.

The connecting cable 4 may be coupled to a transmitting member (not shown) receiving the operation force of the lever 3. [

The valve housing 10 may further include a relief valve 8 for relieving the pressure of the supplied oil when the pressure of the supplied oil is increased to the maximum set pressure or more.

A plurality of the relief valves 8 may be installed, and may be installed adjacent to a supply pipe through which oil is supplied.

The first and second spool shafts 100 and 200 may be disposed outside the first and second spool shafts 100 and 200 by being protruded by a predetermined length in a state where the first and second spool shafts 100 and 200 are inserted into the valve housing 10.

The first and second spool shafts 100 and 200 may be provided with an end cap 20 mounted on the valve housing 10, respectively.

The end cap 20 has a predetermined length and may have a hollow interior.

First and second support members 300 and 400 may be installed in the end cap 20, respectively.

The first and second supporting members 300 and 400 can be coupled to the lower ends of the first and second spool shafts 100 and 200 and can transmit operating force operated along the longitudinal direction of the first and second spool shafts 100 and 200 have.

The first and second support members 300 and 400 may have a support shaft having a predetermined length at the center, and a spring may be provided outside the support shaft.

The spring can be downwardly supported by a protrusion provided on the inner side of the end cap 20.

The first and second support members 300 and 400 may be provided with spring portions 30 on the lower side.

The spring unit 30 may further include a spring 32 having a predetermined length and a spring seat 34 disposed on the spring 320.

The spring seat 34 may be partially inserted into the spring 32 and the upper end may be retained by the spring 32.

In addition, the spring seat 34 may be provided with a gap holding member 36 for restricting the movement of the first and second support members 300 and 400.

The loader valve according to the present invention will be described with reference to FIGS. 6 to 7 attached hereto.

The loader valve 1 is configured such that the end cap 20 is detached from the loader valve 1 so that the specific function of the loader valve 1 is not used depending on the type of the working machine mounted on the tractor, The stopper 500 can be installed.

The stopper 500 may be formed in a ring shape having a hole at the center where the support shaft of the first and second support members 300 and 400 is inserted.

The thickness of the stopper 500 is set to a thickness for restricting the movement of the first and second spool shafts 100 and 200 with respect to a predetermined section of the entire stroke of the first and second spool shafts 100 and 200 .

For example, boom up, boom down, roll-back, and dump functions are maintained, while power dump and floating functions are not used .

The use state of the tractor loader valve according to an embodiment of the present invention constructed as above will be described with reference to FIG.

The user operates the lever 3 to move the lever 3 to the roll-back position to implement a roll-back function for loading or unloading the load on the bucket.

The oil stored in the sump 80 is pumped through the pump 70 to the loader valve and is supplied to the inner area of the valve housing through the connecting pipe 72.

The loader valve can receive the operation force of the lever 3 and the second spool shaft 200 can be moved in the direction of the arrow.

The loader valve is moved to the bucket cylinder 50 through the supply pipe 54 for operation of the bucket cylinder 50. [

The bucket cylinder 50 is operated to load or unload a load on the bucket, and the oil can be moved back to the valve housing through the water return pipe 52.

The transferred oil is returned to the sump 80 through the drain pipe 60 and can be continuously supplied into the valve housing by the pump 70.

The tractor thus used can be used by replacing the working machine for a specific operation, which will be described with reference to Fig. 9 attached hereto.

The operator can operate the lever 3 in a boom-down state, and the lever 3 can be inadvertently moved to a floating position.

The loader valve is operated by the stopper 500 to rotate the first spool shaft 100 and the first support member 300 (i.e., the first spool shaft 100) by the stopper 500 even when the first spool shaft 100 is moved in the arrow direction for operation of the boom cylinder 40. [ Is limited.

Therefore, the oil stored in the sump 80 is not supplied to the valve housing through the pump 70, and the oil supply to the supply pipe 44 and the water return pipe 42 is not performed. The boom cylinder 40, (3) is not performed.

Therefore, malfunction of the working machine and unnecessary work are not caused by careless mistakes of the operator.

Referring to Fig. 10, the operator can manipulate the lever 3 in the dump state and move the lever 3 to the power dump position by mistake.

The loader valve is operated by the stopper 500 to move the second spool shaft 200 and the second support member 400 (i.e., the second spool shaft 200) by the stopper 500 even when the second spool shaft 200 is moved in the direction of the arrow for operation of the bucket cylinder 50 Is limited.

The oil stored in the sump 80 is not supplied to the valve housing through the pump 72 and the oil supply to the supply pipe 54 and the return pipe 52 is not performed, The floating operation by the lever 3 is not performed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

1: tractor
3: Lever
10: Valve housing
100, 200: first and second spool shafts
300, 400: first and second support members
500: Stopper

Claims

A first and second spool shafts provided in the tractor and having a plurality of grooves spaced apart from each other and inserted into a valve housing having a hydraulic line;
First and second support members respectively coupled to the lower ends of the first and second spool shafts and positioned inside the end cap coupled to the outside of the valve housing;
And a spring portion provided inside the end cap and including a spring, a spring seat provided on one side of the spring, and a space holding member between the spring seat and the first and second support members,
The boom cylinder is operated to be interlocked with the movement of the first spool shaft, the movement of the second spool shaft is interlocked with the operation of the bucket cylinder,
And a stopper provided between the end cap and the first and second support members after the spring portion is separated from the end cap so as to selectively restrict movement of the first and second spool shafts. .

delete

The method according to claim 1,
The stopper
Wherein the movement of the first and second spool shafts is restricted with respect to a predetermined section of all the strokes in which the first and second spool shafts are operated.