KR20160101791A - Power transmission device for excavating equipment - Google Patents

Abstract

The present invention provides a bearing supporting device for a power transmission device for excavating equipment, which can provide stable supporting status of a thrust bearing. The bearing supporting device of the present invention comprises: a ring gear (8) to receive power for deceleration; a casing (10) to support the ring gear to be able to rotate inside; a hollow shaft (20) which rotates while being in contact with the ring gear and has a flange (22) extended outward and a penetrating hole (24); a bearing housing (18) supported by the casing (10); a pair of thrust bearings (40a, 40b) installed in between the bearing housing and the hollow shaft and installed on the top and the bottom of the flange to support the hollow shaft (20) against vertical external force; a radial bearing (50) installed in between the bearing housing and the hollow shaft to support the hollow shaft against external force in a radial direction; and an elastic member (26) installed in the penetrating hole (24) to provide a certain elastic force or greater always to the pair of thrust bearings (40a, 40b). The thrust bearing comes to roll by always receiving a certain force or greater from the elastic member.

Description

Technical Field [0001] The present invention relates to a power transmission device for excavating equipment,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for a drilling rig, and more particularly to a power transmission device for a drilling rig, which is designed to apply a predetermined external force to a thrust bearing that axially supports a component that transmits power through rotation, And more particularly to a bearing support apparatus for a power transmission device of a drilling rig that is constructed to be able to support a bearing.

Various equipments and various methods are applied to excavation work to form a hole with a certain size with respect to the ground by continuously performing a hitting operation using a hammer equipped with a bit. One example of such a method is the RCD (Reverse Circulation Drilling) method, which transfers the rotational force while supplying air to the excavation part of the ground, and discharges the slime generated during excavation like air. We will proceed with the work.

In the excavation equipment that performs the RCD method, air is supplied to the ground where the excavation works on the outside, and rotational power is also transmitted. Such transmission of the rotational power is achieved by rotating a hollow shaft that transmits the rotational force to the lower portion where the excavation proceeds. The transmission of the power to the hollow shaft is generally performed by transmitting the decelerated output to the main ring gear provided at the center by using the planetary gear reducer.

However, in the structure in which the hollow shaft rotates substantially, a bearing for supporting the rotation of the hollow shaft must be provided. Here, in the rotational movement of the hollow shaft, it is natural that the hollow shaft which rotates can be firmly supported only by providing the bearing device for the axial direction and the radial direction. However, according to the conventional structure, there is no specific proposal for a bearing support structure that is rigid in the axial direction and the radial direction with respect to such a hollow shaft.

The excavation equipment in the present invention is a collective term for various excavation works which form a constant bore ring in the ground, and it is natural to include, for example, excavation works for wind power generation. In addition, it is natural that the present invention can be applied to a case where a drilling operation is performed while using a rotational force as at least a part of power.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bearing support device for a power transmission apparatus which can increase the reliability of a thrust bearing that axially supports a hollow shaft in a drilling rig.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a bearing support apparatus comprising: a ring gear that receives power for deceleration; A casing rotatably supporting the ring gear therein; A hollow shaft having a flange that rotates in contact with the ring gear and extends outwardly and has a through hole; A bearing housing supported by the casing; A pair of thrust bearings installed between the bearing housing and the hollow shaft and installed respectively at the upper and lower portions of the flange so as to support the hollow shaft against an external force in a vertical direction, A radial bearing installed to support a hollow shaft with respect to an external force in a radial direction and an elastic member provided inside the through hole so as to always provide an elastic force greater than a certain level with respect to the pair of thrust bearings It can be understood that a pair of thrust bearings provided respectively on the upper and lower sides of the flange can be in a state of always receiving a predetermined elastic force (force) by the elastic member.

The elastic member may be composed of, for example, a coil spring. The upper and lower ends of the coil spring always contact the thrust bearing, so that the coil spring can always apply a predetermined elastic force.

According to another embodiment of the present invention, there is provided a hydraulic control apparatus for an internal combustion engine, comprising: a hydraulic motor for generating a rotational power by hydraulic pressure; a speed reducer for decelerating a rotational force generated by the hydraulic motor; And a plurality of pinions for transmitting the plurality of pinions.

 According to the present invention having the above-described structure, it can be seen that the upper and lower thrust bearings always receive a force exceeding a predetermined level by the elastic member such as the coil spring, thereby always performing the rolling motion. Therefore, it can be understood that the damage and breakage of the bearing, which may occur due to the idle or slip of the thrust bearing, can be sufficiently prevented. Therefore, by applying the present invention, it is expected that the structure for transmitting power to the drilling apparatus can be maintained in a more reliable state.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a general outline of a power transmission device of the present invention. FIG.
FIG. 2 is an enlarged cross-sectional view showing the essential part of the present invention. FIG.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings. 1 and 2, a power transmission device for transmitting power to a drilling rig includes a hydraulic motor 2, a speed reducer 4 for reducing the rotational force of the hydraulic motor, And includes a rotating pinion 6.

The hydraulic motor 2 generates a rotational force by hydraulic pressure and is a basic driving means for transmitting power to the excavator. The rotational force in the hydraulic motor 2 is decelerated through the speed reducer 4 so as to have a necessary number of revolutions. The speed reducer 4 may be any type having a suitable reduction ratio required for excavation work, and in this embodiment, a planetary gear reducer is used.

The decelerated rotation output through the speed reducer 4 is transmitted to the pinion 6. The pinion 6 meshes with the ring gear 8 so as to rotate the ring gear 8 substantially. The hydraulic motor 2, the speed reducer 4 and the pinion 6 may be constituted as many as necessary to transmit a rotational force having a proper torque to the ring gear 8 designed at the center.

The ring gear 8 can be said to transmit the power for excavation to the lower excavation portion. The pinion 6 and the ring gear 8 are supported inside the casing 10. [ It will be appreciated that a suitable bearing may be provided between the casing 10 and the pinion and ring gear to support rotation of the pinion 6 and the ring gear 8 within the casing 10 . A speed reducer 4 such as a planetary gear reducer is mounted and supported on the outer surface of the casing 10 and the hydraulic motor 2 is installed and supported on an outer portion of the reducer 4.

In the casing 10, a hollow shaft 20 is coupled to a central portion of the ring gear 10. For example, a spline coupling portion 22 is formed between the central portion of the ring gear 10 and the outer surface of the hollow shaft 20. Therefore, it can be seen that the ring gear 10 and the hollow shaft 20 are designed to interlock with each other by, for example, a spline structure. Therefore, it can be seen that the rotation of the ring gear 10 is transmitted to the hollow shaft 20.

The hollow shaft 20 is rotatably supported in the casing 10 and is supported by a plurality of bearings 40 and 50 as described later. It is natural that another component for supporting the hollow shaft in the casing to be rotatable can be built in between the hollow shaft 20 and the casing 10. [

An inner pipe 30 is installed in the hollow shaft 20 so as to rotate while interlocking with the inner pipe 30. A constant outer space Ra is formed between the hollow shaft 20 and the inner pipe 30. The outer space Ra serves to supply compressed air required for excavation work to the ground. The inner space Rb formed in the inner pipe 30 has a function of discharging the slime generated at the time of excavation to the outside like the air supplied to the excavation portion.

The hollow shaft 20 rotated by the ring gear 8 is rotatably supported inside the casing 10 as described above. That is, a plurality of bearings 40 and 50 for supporting the rotation of the hollow shaft 20 are installed in the casing 10. The bearing for supporting the rotation of the hollow shaft 20 includes a thrust bearing 40 that functions to support the hollow shaft 20 with respect to an axial external force and a thrust bearing 40 that supports the hollow shaft 20 And a radial bearing (50) for supporting the rotation of the rotor (20).

That is, since the hollow shaft 20 must be accurately supported in the axial direction and the radial direction with respect to the external force generated by the rotation, the radial bearing 50 and the thrust bearing 40 are simultaneously applied It can be said that. These bearings 40 and 50 are supported by a bearing housing 18 fixed to the lower portion of the casing 10. [ The bearing housing 18 is constituted by a plurality of (three) parts 18a, 18b and 18c as shown in the illustrated embodiment, while forming one bearing housing as a whole by welding or the like, As shown in Fig.

Hereinafter, a bearing support apparatus according to the present invention will be described with reference to FIG. A thrust bearing 40 and a radial bearing 50 which are respectively supported by a bearing housing 18 are installed on the outer side of the hollow shaft 20 corresponding to the lower portion of the casing 10 as shown in the figure. As described above, the radial bearing 50 supports the radial external force due to the rotation of the hollow shaft 20 while the outer portion thereof is supported by the bearing housing 18.

The structure of the thrust bearing 40 supporting the axial load of the hollow shaft 20 will now be described. The thrust bearing 40 is composed of a pair 40a and 40b. It can be seen that the pair is partitioned and supported by the flange 22 formed outwardly from the hollow shaft 20. That is, the hollow shaft 20 is formed with a flange 22 extending outwardly, and the thrust bearings 40a and 40b are supported on the upper and lower portions of the flange 22, respectively.

The flange 22 is formed with a through hole 24 passing through the top and bottom. The through hole 24 has an elastic member 26 built therein. The elastic member 26 can be said to be installed so as to apply a predetermined elastic restoring force to the thrust bearings 40 provided on the upper and lower sides. In the illustrated embodiment, the elastic member 26 is constituted by a coil spring. The upper and lower ends of the coil spring are connected to the upper first thrust bearing 40a and the lower second thrust bearing And 40b.

That is, the coil spring 26 may be compressed to a certain degree between the first thrust bearing 40a and the second thrust bearing 40b. Alternatively, the aforementioned elastic member 26 may be referred to as a state in which a constant load (elastic force) is always applied to the first thrust bearing 40a and the second thrust bearing 40b.

Thrust bearings 40a and 40b are provided on the upper and lower sides of the flange 22 of the hollow shaft 20 so that the thrust bearings 40a and 40b are rotatably supported by the thrust bearings 40 So that one is configured to support the flange 22 with respect to the upward load and the other with the downward load. It is a matter of course that the hollow shaft 20 provided with the flange 22 can receive either upward or downward force due to the reaction force generated in the excavation work process.

As described above, according to the present invention, the elastic member 24 is provided in the through hole 22 of the flange 22, and such elastic member always applies a constant force to the upper and lower thrust bearings 40a and 40b As a basic technical point. By providing a constant elastic force to the upper and lower thrust bearings 40a and 40b in this way, it is possible to prevent the occurrence of idle by removing an external force from any of the thrust bearings.

That is, when the thrust bearing is removed by the load applied thereto, the thrust phenomenon occurs or the slip phenomenon occurs between the thrust bearing and the support object. It is a known fact that when such a phenomenon occurs, the thrust bearing is substantially damaged, or breakage may occur due to such damage. In the present invention, the flange 22 is formed on the hollow shaft 20 so that the upper and lower thrust bearings are supported by the upper and lower thrust bearings 40a and 40b, and an elastic member for applying a predetermined elastic force to the upper and lower thrust bearings 40a and 40b is provided. .

By this configuration, it can be seen that the pair of thrust bearings 40a and 40b installed can always maintain the rolling motion, and it is possible to solve various disadvantages caused by the removal of the external force . It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the present invention. It is to be understood that the scope of the present invention should be interpreted based on the scope of the appended claims.

2 ..... Hydraulic Motor
4 ..... Reducer
6 ..... pinion
8 ..... ring gear
10 ..... casing
18 ..... Bearing housings
20 ..... hollow shaft
22 ..... Flange
24 ..... through hole
26 ..... elastic member
30 ..... Internal pipe
40 ..... Thrust bearings
50 ..... Radial Bearing

Claims (3)

A ring gear (8) for receiving power for deceleration;
A casing 10 rotatably supporting the ring gear therein;
A hollow shaft (20) having a flange (22) that rotates in contact with the ring gear and extends outwardly and has a through hole (24);
A bearing housing (18) supported by the casing (10);
A pair of thrust bearings (40a, 40b) installed between the bearing housing and the hollow shaft, the pair of thrust bearings (40a, 40b) being respectively installed on the upper and lower sides of the flange so as to support the hollow shaft (20)
A radial bearing (50) installed between the bearing housing and the hollow shaft, the radial bearing being installed to support a hollow shaft with respect to an external force in a radial direction; And
And an elastic member (26) installed in the through hole (24) so as to always provide an elastic force greater than a predetermined level to the pair of thrust bearings (40a, 40b) Bearing support device of power transmission device.
The bearing support device of claim 1, wherein the elastic member (26) is formed of a coil spring, and the upper and lower ends thereof are always in contact with the thrust bearings (40a, 40b).
3. The method according to claim 1 or 2,
And a plurality of pinions that rotate by the speed reducer and are coupled to the outside of the ring gear to transmit power, wherein the plurality of pinions include: a hydraulic motor for generating a rotational power by hydraulic pressure; a decelerator for decelerating a rotational force generated by the hydraulic motor; A bearing support apparatus for a power transmission apparatus for a digging equipment.

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