KR101502462B1 - Hydraulic device for transmission of excavator - Google Patents

Abstract

The present invention discloses a hydraulic device for a transmission of an excavator. The present invention relates to a transmission for an excavator capable of controlling power in a high speed and low speed mode and in a neutral mode by interrupting power using two clutches provided therein by oil pressure introduced from three ports connected to an external hydraulic pressure source A base block 100 having two inlet ports Ia and Ib and three outlets Oa, Ob and Oc and having a cylindrical groove 110 formed by threading the inner wall, and; And a moving block 120 having an outer circumferential surface threaded into the groove 110 so as to be screwed with the inner wall of the groove 110 and having an inner passage 122 having an inlet and an outlet. When the movable block 120 is in the first position inside the groove 110, the two inlets Ia and Ib can communicate with the two outlets, respectively, and the movable block is moved to the second position inside the groove 110 Any one inlet is configured to communicate with the other outlet through the internal passageway (122).

Description

[0001] Hydraulic device for transmission [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic device used in an excavator transmission, and more particularly, to a hydraulic device capable of maintaining a neutral state through operation of an operation seat during operation of the engine, .

Generally, a transmission used in a heavy equipment such as an excavator is controlled in various modes. Generally, the operation mode is controlled by hydraulic pressure. Examples include a parking brake mode for excavation work, a low speed and high speed mode, and a neutral mode. And a technique disclosed in Korean Patent No. 10-0904790 as a conventional technique for a heavy equipment driving apparatus such as an excavator. Fig. 1 schematically shows a transmission including such a conventional driving device.

Hereinafter, description of the prior art is described in detail in the above-mentioned patent publications, so that a detailed description thereof will be omitted, and only a portion corresponding to the hydraulic pressure supply apparatus of the present invention will be described. According to the above-mentioned conventional driving apparatus, as shown in Fig. 1, three hydraulic ports Pa, Pb and Pn are provided. When the hydraulic pressure is supplied to the first port Pa, the first cylinder 22 is moved to the right in the drawing, so that the first clutch 20 composed of the wet multi-plate clutch is opened and controlled to the low speed mode.

When the hydraulic pressure is supplied to the second port (Pb), the second cylinder (24) moves to the right side in the drawing, and the first clutch (10) is in an open state, thereby becoming a substantially high speed mode. When the hydraulic pressure is supplied to the third port Pn, the third cylinder (neutral cylinder) 26 moves to the right in the drawing. At this time, the third cylinder 26 moves to the second cylinder 24 and the first cylinder 22 in the rightward direction. Therefore, both the first clutch 20 and the second clutch 10 are in the open state and are brought into the neutral state. This neutral state is a mode in which the excavator can move substantially due to external force.

However, according to the above-described prior art, whether or not the hydraulic pressure is supplied to the first port and the second port can be directly adjusted by the operator. However, when the hydraulic pressure is supplied to the third port for controlling the neutral state, And the pump is connected to the third port and is manually operated. In other words, this leads to inconveniences in operation, which means that there is a disadvantage that a separate hydraulic pump must be driven in order to be brought into a neutral state under an emergency situation such as a failure of an excavator.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydraulic device capable of easily controlling a heavy-duty transmission such as an excavator to a neutral state.

The object of the present invention can be realized by a hydraulic device configured to distribute a pair of hydraulic pressure sources, which can be adjusted by an operator, to three hydraulic ports according to circumstances.

According to the present invention, the power is interrupted by two clutches provided in the three ports connected to the external hydraulic source, and the speed of the excavator can be controlled in a high-speed and low- A hydraulic device mounted on the transmission; A base block having two inlets and three outlets and having a cylindrical groove formed therein whose inner wall is threaded; And a moving block having an outer circumferential surface threaded into the groove so as to be screwed with the inner wall of the groove and having an inner passage having an inlet and an outlet. When the moving block is in the first position in the groove, the two inlets can communicate with the two outlets, respectively, and when the moving block is in the second position inside the groove, So as to be communicated with the outlet of the main body.

Here, in the first position, the first inlet communicates with the first outlet through the interior of the groove, and the second inlet communicates with the third outlet via an inlet formed in the entire peripheral surface of the moving block. Also in the second position, the second inlet communicates with the inlet and the internal passageway, and the outlet through the second outlet.

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According to the present invention, it is possible to perform the parking brake mode for the operation of the excavator, and the necessary neutral mode in addition to the high-speed and low-speed modes as well as the hydraulic device of the present invention. In other words, since the flow path is changed by a simple operation, it is possible to supply the hydraulic pressure to the neutral port in the conventional high-pressure port flow path, and it is possible to expect an advantage in use that a separate hydraulic pump or the like becomes unnecessary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a structure of a conventional transmission and an example of a hydraulic port. FIG.
2 is an exemplary sectional view of a normal mode of a hydraulic device according to the present invention;
3 is an exemplary cross-sectional view of a neutral mode of a hydraulic device according to the present invention.

Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. 2 shows a hydraulic device according to the present invention in a general mode. The hydraulic device of the present invention can be said to be a device configured to appropriately distribute the hydraulic pressure supplied from the hydraulic pressure source. The hydraulic device of the present invention may be installed at one side of the heavy-duty transmission as described above, and may be directly connected to a hydraulic port communicating with the inside of the transmission.

As shown in Fig. 2, the hydraulic device of the present invention has two hydraulic inlets Ia and Ib and three hydraulic outlets Oa, Ob and Oc. That is, it can be said that a hydraulic device capable of controlling the oil introduced through two inlets to be selectively discharged through three outlets.

The reference block 100 of the hydraulic device of the present invention has two hydraulic inlets Ia and Ib and three hydraulic outlets Oa, Ob and Oc, as described above. In the reference block 100, a cylindrical groove 110 is formed, and an inner wall of the cylindrical groove 110 is subjected to a female threading process (tapping process). In the illustrated embodiment, the groove 110 is opened at one side, but the substantially opened portion is clogged by a plug (not shown), so that the groove 110 is kept in a clogged state.

A moving block 120 is inserted into the groove 110. The moving block 120 is a cylindrical member which can be inserted into the groove 110. The outer circumferential surface of the moving block 120 is male- 110, respectively. A hexagonal wrench groove 128 is formed in the upper portion of the moving block 120 so that the hexagonal wrench groove 128 can be moved along the direction of the groove (up and down direction in the drawing) inside the groove 110 .

The mobile block 120 has an internal passageway 122 having an inlet 124 and an outlet 126. In the illustrated embodiment, the inlet 124 and the outlet 126 of the moving block 120 are formed over the entire outer peripheral surface of the cylindrical moving block 120. Next, a description will be given of a path in which the oil supplied by the hydraulic device of the present invention is distributed and supplied to the inside of the transmission.

The state shown in Fig. 2 can be referred to as a normal mode (first position), and the excavator operates in this normal mode. In this state, the oil entering the first inlet Ia is directly supplied to the first outlet Oa through the inside of the groove 110. [ The first outlet Oa is supplied to either the first port or the second port of the transmission shown in Fig.

And the oil entering the second inlet Ib is supplied to the inlet 124 where the inlet 124 is formed substantially across the entire circumference of the moving block 120, And then to the third outlet Oc. The third outlet Oc is supplied to either the first port or the second port of the transmission shown in Fig.

That is, the oil supplied through the first outlet Oa and the third outlet Oc is selectively supplied to the first port or the second port in the transmission shown in FIG. 1, respectively, one on the other. The oil supplied to the first port or the second port in the transmission drives the transmission to enable high-speed and low-speed travel, as described above. That is, when the hydraulic pressure is supplied through the hydraulic device of the present invention, the hydraulic pressure is selectively supplied through the first outlet and the third outlet, respectively, whereby the high speed mode and the low speed mode of the excavator can be selectively determined have.

Next, let's look at the supply of oil to maintain the neutral mode of the transmission. For the neutral mode, the mobile block 120 must be operated as shown in FIG. That is, a tool such as a hexagonal wrench is operated by using the hexagonal wrench groove 128 to rotate the movable block 120 to operate the position as shown in Fig.

When the hydraulic fluid is supplied to the second inlet Ib in this state, the fluid is supplied from the first inlet Ib through the inlet 124, the inner passage 122, and the outlet 126 of the moving block, (Ob). And the second outlet Ob is substantially connected to the third port (neutral port) of the transmission. 1, when the hydraulic pressure is supplied to the third port Pn of the transmission through the second outlet Ob in the neutral mode of the hydraulic apparatus, the third cylinder (neutral cylinder) And the third cylinder 26 moves the second cylinder 24 and the first cylinder 22 in the right direction as well. Therefore, both the first clutch 20 and the second clutch 10 are in the open state and are brought into the neutral state. This neutral state can be regarded as a mode in which the excavator can move substantially due to an external force as described above.

In the present invention, it is understood that the basic theme is that hydraulic pressure can be selectively supplied to three ports (high speed, low speed, and neutral mode) in the transmission by distributing the hydraulic pressure through one hydraulic device. The basic operation principle of the hydraulic apparatus according to the present invention is as follows.

2, the oil introduced through the first inlet Ia and the second inlet Ib flows through the first outlet Oa and the third outlet Oa through the first inlet Ia and the second inlet Ib, And the outlet (Oc), respectively. Accordingly, in this state, the hydraulic pressure introduced through the first inlet or the second inlet is selectively supplied to the first port or the second port of the transmission, so that the high or low speed mode can be maintained.

3, the hydraulic pressure flowing through the inlet Ia or Ib on one side can be discharged through the second outlet Ob, and in the state where the moving block 120 is moved as shown in FIG. 3, This is because the oil is supplied to the neutral port (Pn) of the transmission, so that both of the clutches are opened.

As described above, when the hydraulic device according to the present invention is mounted on a heavy-duty transmission such as an excavator, it is possible to selectively output the hydraulic pressure to three outlets using two inlets receiving hydraulic pressure from the outside. Therefore, it would be convenient to control the excavator in the neutral mode without using a separate hydraulic pump in the neutral mode.

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 and scope of the invention as defined by the appended claims. something to do.

100 ..... basic block
110 ..... Home
120 ..... original moving block
122 ..... internal passage
124 ..... entrance
126 ..... Exit

Claims (3)

The hydraulic pressure is applied to an excavator transmission which can be controlled in a high speed and low speed mode and a neutral mode by interrupting the power using two clutches provided therein by hydraulic pressure introduced from three ports connected to an external hydraulic pressure source As a device;
A basic block 100 having two inlets Ia and Ib and three outlets Oa, Ob and Oc in communication with the three ports and having an inner wall threaded cylindrical groove 110, and;
And an inner passage 122 having an inlet 124 and an outlet 126 inserted into the interior of the groove 110 so as to be threadably engaged with the inner wall of the groove 110, 120);
When the movable block 120 is in the first position inside the groove 110, the first inlet Ia communicates with the first outlet Oa through the interior of the groove 110 and the second inlet Ib Communicates with the third outlet Oc via an inlet 124 formed in the entire outer peripheral surface of the moving block 120;
The second inlet Ib communicates with the second outlet Ob via the inlet 124 and the inner passage 122 and the outlet 126 when the moving block is in the second position inside the groove 110 Wherein said hydraulic system is a hydraulic system for an excavator.



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