JPH0828580A - Split type bearing and split type sleeve for rotary machine having fastener of shape memory alloy - Google Patents

Abstract

PURPOSE:To simplify a shape and eliminate a need for size precision and to reduce weight and facilitate disassembly by intercoupling the two half parts of a two-division bearing through a fastener of a shape memory alloy in a sectional shape having a lock part. CONSTITUTION:A half part 2 in a shape wherein the cylinder of a bearing is divided into two sections by a cutter having width W is formed and the two half parts 2 are intercoupled through a fastener 5 of shape memory alloy. Length L between the circular section parts 6 of the fastener 5 is stored as a length L1 at an ordinary atmosphere temperature and a length L2 shorter than the length L1 at a low temperature. Further, when during disassembly, the fastener 5 is cooled, the length is contacted to the L2, the fasteners are easily pulled out from the two half parts 2 and the two half-parts 2 are removed from the bearing case 8. This constitution simplifies a shape and eliminates a need for high size precision, and facilitates reduction of weight and disassembly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split bearing and a split sleeve for a rotary machine having a shape memory alloy fastener.

[0002]

2. Description of the Related Art Split bearings and sleeves are mainly used for large-sized rotary machines, in which the bearings and sleeves are difficult to disassemble, or one of which is heavy and difficult to handle. And, generally, a structure in which a flange or a band is connected and fixed is adopted (for example, JP-A-6-1472).
No. 28).

[0003]

In the conventional structure for connecting and fixing with a flange or band, high dimensional accuracy is required, and since the shape is complicated, disassembly is difficult and the weight is heavy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a split type bearing and a split type sleeve for a rotary machine having a fastener of a shape memory alloy which is simple in shape and does not require high dimensional accuracy and is lightweight and easy to disassemble.

[0005]

According to the present invention, both halves of a bearing which is divided into two parts are connected to each other by a fastener made of a shape memory alloy having a cross-sectional shape having a locking portion.

For the fastener, a shape memory alloy having a property that the length at low temperature is shorter than the length at normal temperature is used.

Further, according to the present invention, both halves of the sleeve divided into two are connected to each other by a fastener made of a shape memory alloy having a cross-sectional shape having a locking portion.

For the fastener, a shape memory alloy having a characteristic that the length at low temperature is longer than the length at normal temperature is used.

[0009]

In the split type bearing constructed as described above, when both halves of the bearing are loosely connected with the fastener at a low temperature, the fastener is stretched at high temperature and both halves are tightly fixed to the bearing case. It

Further, in the sleeve, when the both halves are loosely connected with the fastener at a low temperature, the fastener shrinks at the atmospheric temperature, and the both halves are tightly fixed to the shaft.

When disassembling both the bearing and the fastener by cooling the fastener with, for example, liquid nitrogen, both halves are loosely connected to the initial state, so that they can be easily removed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the split type bearing 1 is supported by a bearing support 9 via a bearing case 8, and a split type sleeve 11 which is in sliding contact with the bearing 1 is fixedly mounted on a shaft 10.

In FIG. 2, the bearing 1 comprises half portions 2 and 2 each having a shape obtained by dividing a cylinder into two pieces by a cutter having a width W (FIG. 4), and fasteners 5 and 5 connecting the both half portions 2 and 2. Has become. Note that the width W is a clearance C sufficient for assembly (Fig. 3).
It is adopted in the length that can be obtained.

The fastener 5 is made of a shape memory alloy such as a Ni-Ti alloy and is formed in a gourd shape in which circular cross-sections 6, 6 at both ends which are locking portions are connected by a rectangular cross-section 7. Therefore, on both end surfaces 3 and 3 of the half portion 2, a groove portion 4 that engages with the sectional shape of the end portion of the fastener 5 is engraved.

The circular cross-section portions 6, 6 of the fastener 5 are
The length L is stored as a length L1 at a normal atmospheric temperature and a length L2 at a low temperature which is shorter than the length L1. And
The length L1 is the length 2 that holds the width W as shown in FIG.
The length L2 is set to a length for joining the end faces 3 and 3 as shown in FIG.

Next, the operation will be described.

Assembling the bearing 1 into the bearing case 8 is shown in FIG.
As shown in FIG. 3, the fastener 5 is cooled with liquid nitrogen or the like to a length L2, the half portions 2 and 2 are assembled in the bearing case 8 with the end surfaces 3 and 3 aligned, and the fasteners 5 and 5 are connected. Therefore, in this state, a sufficient gap C is formed between the outer circumferences of the halves 2 and 2 and the inner circumference of the bearing case 8. After the assembling, the fasteners 5 and 5 are heated at the atmospheric temperature and extend from the length L2 to the length L1. Therefore, as shown in FIG. 4, the end portions 3 and 3 of the halves 2 and 2 facing each other are expanded so that the bearing 1 is tightly fixed to the bearing case 8.

At the time of disassembly, when the fasteners 5 and 5 are cooled, the fasteners 5 and 5 contract to the length L2 and can be easily pulled out from the halves 2 and 2 to remove them from the bearing case 8.

FIG. 5 shows another embodiment of the present invention.

The split sleeve 11 fixed to the shaft 10 has a packing 8a provided in a packing case 9a.
Are in sliding contact with each other.

In FIG. 6, the sleeve 11 is composed of half-arc-shaped halves 12 and 12, and fasteners 15 and 15 connecting the halves 12 and 12.

The fastener 15 is the fastener 5 described above.
Substantially the same as the circular cross-sections 16 and 16 and the rectangular cross-section 17 and both end surfaces 13 and 13 of the sleeve 12 are engaged with the end cross-sectional shape of the fastener 15 by the groove section 1.
In the example shown, 4 and 14 are engraved at the top and bottom.

The circular cross section 1 of the fastener 15
The length L between 6 and 16 is stored as a length L3 at a normal atmospheric temperature and a length L4 longer than the length L3 at a low temperature.
The length L3 is the length for joining the end faces 13 and 13 as shown in FIG. 8, and the length L4 is the length between the end faces 13 and 13 of both halves 12 and 12 as shown in FIG. The length is set so that a sufficient clearance C1 can be obtained.

Next, the operation will be described.

As shown in FIG. 7, the sleeve 11 is assembled to the shaft 10 by cooling the fastener 15 with liquid nitrogen or the like to a length of L4 and then assembling the halves 12 and 12 to the outer periphery of the shaft 10. , Halves 12, 12 fasteners 15, 15
Connect with. Therefore, in this state, the halves 12, 1
A sufficient gap C1 is formed between the inner circumference of 2 and the outer circumference of the shaft 10. After the assembling, the fasteners 15 and 15 are heated at the atmospheric temperature and contract from the length L4 to the length L3.
Therefore, as shown in FIG. 8, the half portions 12 and 12 are joined to each other at the end faces 13 and 13 that face each other, and the sleeve 11 is
It is fixed tightly at 0.

At the time of disassembly, when the fasteners 15 and 15 are cooled, they extend to the length L4 and can be easily pulled out from the halves 12 and 12 to remove the halves 12 and 12 from the shaft 10.

[0028]

Since the present invention is constructed as described above, it is possible to simplify the shape, eliminate the need for high dimensional accuracy, and reduce the weight and facilitate disassembly.

[Brief description of drawings]

FIG. 1 is a side sectional view around a split bearing showing an embodiment of the present invention.

2 is a perspective view showing the split type bearing of FIG. 1. FIG.

FIG. 3 is a perspective view showing a state when the bearing is assembled.

FIG. 4 is a perspective view showing a state after the bearing is assembled.

FIG. 5 is a side sectional view around a split sleeve showing another embodiment of the present invention.

6 is a perspective view showing the split sleeve of FIG. 5. FIG.

FIG. 7 is a perspective view showing a state when the sleeve is assembled.

FIG. 8 is a perspective view showing a state after the sleeve is assembled.

[Explanation of symbols]

 C, C1 ... Gap L, L1 to L4 ... Length between circular cross-sections 1 ... Split bearing 2, 12 ... Half part 3, 13 ... End face 4, 14 ... Grooves 5, 15 ... Fasteners 6, 16 ... Circular cross section 7, 17 ... Rectangular cross section 8 ... Bearing case 8a ... Packing 9 ... Bearing support 9a ... Packing case 10 ···axis

Claims (4)

[Claims] 1. A rotary machine having a shape memory alloy fastener, characterized in that both halves of a bearing which is divided into two parts are interconnected by a shape memory alloy fastener having a cross-sectional shape having a locking portion. Shaped bearing. 2. The split bearing having a shape memory alloy fastener according to claim 1, wherein a shape memory alloy having a property that a length at a low temperature is shorter than a length at a normal temperature is used for the fastener. 3. A rotary machine having a shape memory alloy fastener, characterized in that both halves of a sleeve divided into two parts are connected to each other by a shape memory alloy fastener having a cross-sectional shape having a locking portion. Shaped sleeve. 4. The split sleeve having a shape memory alloy fastener according to claim 3, wherein a shape memory alloy having a characteristic that a length at a low temperature is longer than a length at a normal temperature is used for the fastener.