JPS5939211Y2 - bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing device comprising a bearing and an assembled member to which the bearing is assembled.

Bearings used in rotating parts of equipment are generally fixed to the parts to be assembled by press-fit shrink fitting, etc., but when the bearings are used in a high-temperature atmosphere, the thermal expansion of the parts to be assembled is greater than that of the bearings. If it is too large, the bearing may become loose and the bearing may no longer perform its original function.

For example, as shown in Fig. 1, in a turbine meter used to measure the flow rate of fluid, the front and rear cones 1 and 2, the hub 3, and the blade 4 fixed to the hub 3 are made of stainless steel. A bushing 5 formed of a rope and press-fitted into the inside of the hub 3, a journal 6 that rotatably supports this bushing 5, and furthermore, front and rear cones 1, 2.
Bearings such as the thrust bearings 7.8 provided on the side facing the bushing 5 may be made of a high hardness material such as cemented carbide.

In this case, the coefficient of thermal expansion of the former stainless steel is 18.4.
X 10-6/°C, whereas that of the latter cemented carbide is 5 to 7 X 10-67'C, which is about a three-fold difference.

Therefore, when the turbine meter is used in a high-temperature atmosphere, for example, the hub 3 and the bushing 5 become loose, and what should normally rotate between the bushing 5 and the journal 6 is replaced by the hub 3, which is an assembled member. There is a risk that an inconvenience may occur, such as rotation between the bushing 5 and the bushing 5, which is a bearing.

An object of the present invention is to provide a bearing device that can eliminate the above-mentioned disadvantages.

This will be explained below based on a specific example.

As shown in FIG. 2, a journal 11 is shrink-fitted onto a shaft 10, and a bushing 13 is press-fitted into a member to be assembled, for example, a hub 12 of the turbine meter.

This bushing 13 is a bearing constructed according to the present invention, and has a central cylindrical portion 14 in sliding contact with the journal 11.
It has an integral structure in which an annular part 15 extends radially outward from one end, and a cylindrical fitting part 16 extends from the H-shaped end of the annular part 15 in the same direction as the cylindrical part 14. ing.

The member to be assembled 12 is provided with a through hole 17 into which the cylindrical portion 14 of the bushing 13 is fitted, an annular receiving surface 18 is formed from one end of the through hole 17, and an annular groove 1 is formed in the receiving plate l.
form 9.

When the bearing and the member to be assembled are formed as described above and the bearing is press-fitted into the member to be assembled, the fitting portion 16 of the bearing is fitted into the groove 19, and the annular portion 15 is brought into close contact with the receiving surface 18. A space 21 is formed between the fitting portion 16, the cylindrical portion 14, and the annular portion 15, and the space 21 fits the protruding portion 20 of the member to be assembled 12. Become.

As a result, even if a thermal expansion difference occurs between the bearing and the assembled member, the protruding portion 20 expands within the space 21, so that the two remain firmly attached, and no loosening occurs. do not have.

FIG. 3 shows another example in which a bushing 13 shaped in the same manner as the bushing 13 is press-fitted into the member to be assembled 12 from both sides of the member to be assembled.

In each of the above-mentioned pieces, the fitting part 16 extends from the cylindrical part 14 via the annular part 15, and the fitting part 16 is provided over the entire circumference of the cylindrical part 14, but instead of this, as shown in FIG. It is also possible to form an inset part.

In this bearing 23, there are dovetails 2 in four directions from the cylindrical portion 24.
6 is extended and each dovetail tenon is used as an inset part.

The dovetail tenon 26 only needs to extend slightly from one end of the cylindrical portion 24 in the length direction of the cylindrical portion 24, and does not need to be provided over the entire length of the cylindrical portion 24.

The assembly is completed by shaping the dovetail tenon 26, forming a dovetail groove in the member to be assembled, and press-fitting it.

In this example, the dovetail tenon 26 is tightened due to thermal expansion of the part of the assembled member located in the space 27 between the dovetail tenons, so the bearing remains firmly fixed as before. do.

The above description deals with bushings as bearings.
The present invention can be similarly applied to thrust bearings 7, 8 as shown in FIG. 1, or to journal 6 if necessary.

When applied to the journal 6, a fitting portion may be provided in the hole portion, which is a hollow portion of the journal, and the protruding portion of the member to be assembled may be fitted into the space provided between the fitting portion and the journal.

According to the present invention, even if there is a thermal expansion difference between the bearing and the assembled member, the assembled member between the fitting part of the bearing and other parts of the bearing, or the fitting part between them, By inversely utilizing the thermal expansion of a certain member to be assembled, it becomes possible to hold both members in a tight state.

Therefore, even if the bearing device is used in a high-temperature atmosphere, no loosening occurs between the bearing and the member to be assembled, so that the inconveniences of the conventional method do not occur.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram schematically showing an example of a turbine meter in which the bearing device of the present invention can be incorporated, FIGS. 2 and 3 are sectional views of the bearing device of the present invention, and FIG. 4 is a plan view of the bearing showing another example. It is a diagram. 10...shaft, 13.23...bearing, 1
4.24... Cylindrical part, 26... Fitting part.

Claims (1)

[Scope of utility model registration request] A fitting part is integrally extended so as to form a space between the cylindrical bearing end and the bearing, and the part to be assembled into which the bearing is fitted or the part to be assembled which is fitted into the hollow part of the bearing. A groove is provided in the member to form a protrusion that fits into the space,
A bearing device in which the fitting portion is fitted into the groove.