JPS6348808Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thrust bearing device for a turbo drill equilong shaft rotating member.

FIG. 1 shows a turbo drill, which is roughly divided into a turbine section a, a rotor b, a bearing section c, and upper and lower seal sections d and e.

In recent years, turbo drills have been used not only for curved drilling but also for straight drilling, and the use of diamond bits has also increased. For this reason, the rotational torque required for turbo drills continues to increase, and along with this, the thrust force due to the fluid pressure difference has become excessive.

On the other hand, due to the nature of downhole motors, it is difficult to simply increase the size of the outer cylinder and apply a large-diameter, large-capacity thrust bearing. Due to this,
This reduces the durability of the thrust bearing, causing the problem that it cannot be operated continuously for long periods of time.

The present invention was developed in consideration of the above, and by arranging multiple thrust bearings in series within a limited space and distributing the support thrust force of each thrust bearing, the thrust bearing The purpose of the present invention is to provide a thrust bearing device that can improve the durability of the bearing.

An embodiment of the present invention will be described below based on FIG. 2. FIG. 2 shows the case where the present invention is applied to a turbo drill. In the figure, 1 is an outer cylinder, and 2 is a rotary rod supported at the axial center of the outer cylinder 1 by a radial bearing 3. 4a and 4b are thrust bearings that are interposed between the outer cylinder 1 and the rotary rod 2 at a distance in the axial direction;
a, 4b are lower rings 5 supported by the outer cylinder 1;
Collar members 6a, 6 fixed to the rotating rod 2 side
It consists of an upper ring 7 which receives force from the rod 2 through rings 5 and 6, and rolling elements 8 such as balls or rollers located between the rings 5 and 7. 9
Thrust rings a and 9b are in contact with the upper side of each thrust bearing 4a and 4b. A pair of disc springs 10a, 1 are provided between the thrust ring 9a of the lower thrust bearing 4a and the collar member 6a.
0b is interposed. Also, the thrust ring 9b of the upper thrust bearing 4b and the collar member 6b
A gap δ is provided between the two. The dimension of this gap δ is determined in relation to the deflection of the disc springs 10a, 10b. In other words, a disc spring has a characteristic that when a predetermined load is applied, only the deflection increases with that load, and the above-mentioned gap δ is the constant load-increased deflection portion of the disc spring that connects the thrust ring 9b to the collar member 6b.
The dimensions are such that they come into contact with each other. Reference numeral 11 denotes an auxiliary spring for ensuring the above-mentioned gap δ and absorbing the looseness of the collar member 6b.

In the above configuration, when a downward force is applied to the rod 2, the thrust force at this time is applied to the collar member 6.
a, 6b, 6c, . . .
Lower thrust bearing 4 via a and 10b
a, and is supported by the outer cylinder 1 via this thrust bearing 4a. When the thrust force increases and the deflection of the disc springs 10a and 10b reaches the gap δ between the upper thrust ring 9b and the collar member 6b,
For loads greater than that, the upper thrust bearing 4b
It is supported by the outer cylinder 1 via.

The thrust bearing device according to the present invention is as described in detail above, and has a plurality of thrust bearings supporting thrust force in the same direction between the rotating rod 2 and supporting members such as the outer cylinder 1 that supports the rotating rod 2. Bearings 4a and 4b are interposed, and a disc spring 1 is inserted in the thrust direction of the component of one of the thrust bearings 4a and 4b.
0a and 10b are interposed, and a gap δ is provided between the components of the other thrust bearing 4b in the thrust direction so as to become zero when the disc springs 10a and 10b are bent by a predetermined amount. Thrust force can be distributed to a plurality of thrust bearings, so a plurality of thrust bearings can be used within a limited space, and its durability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a turbo drill to which the present invention is applied, and FIG. 2 is a sectional view showing an embodiment of the present invention. 1 is an outer cylinder, 2 is a rotary drill, 4a, 4b are thrust bearings, and 10a, 10b are disc springs.

Claims (1)

[Scope of utility model registration request] A plurality of thrust bearings 4a, 4 that support thrust force in the same direction are provided between the rotating rod 2 and a support member such as the outer cylinder 1 that supports the rotating rod 2.
b is interposed, and each of these thrust bearings 4a, 4
A disc spring 10a, 10b is interposed between the components of one of the thrust bearings 4a in the thrust direction, and the disc spring 10a, 10b is interposed between the components of the other thrust bearing 4b in the thrust direction.
A thrust bearing device characterized by providing a gap δ that becomes zero when the bearing is bent by a predetermined amount.