JPS6334309A - Mount jig of shaft and ring body - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Purpose of the Invention [Field of Industrial Application] This invention relates to the connection between a shaft and the inner ring of a rolling bearing, or the connection between a shaft and a rotating ring of a mechanical seal. This relates to a fitting used to connect a ring made of.

[Prior Art 1] Ceramics have a higher high-temperature strength 1a than metal materials, so it can be said that their material properties are utilized only when they are used in a high-temperature region. For these reasons, it has recently been considered that rolling bearings used in high-temperature regions be made of ceramics.

[Problems to be solved by the invention] However, when the shaft is made of metal and the inner ring of the bearing attached to it is made of ceramics, there is a difference in thermal expansion between the two, and the difference in thermal expansion is particularly large at high temperatures. So,
The inner ring of the bearing may be destroyed. For this reason, there is a need for a technology that can reduce the influence of the difference in thermal expansion and reliably fix the two, but to date, no satisfactory technology has been developed.

This also applies to other fixings between the shaft and a ring made of different materials, such as coupling the shaft to a rotating ring of a mechanical seal.

This invention was made in view of the above-mentioned circumstances, and allows rings made of different materials with different thermal expansions to be reliably attached to a shaft, and even when there are temperature changes, the state at the time of ring attachment is always maintained. It is an object of the present invention to provide a shaft-to-ring attachment that is easy to maintain and simple in construction.

(B) Structure of the invention [Means for solving the problem] Corresponding to this purpose, the shaft and ring body mount of the present invention includes:
A shaft mount disposed between the shaft and the 1M body when fitting a ring body made of a second material onto a shaft made of a first material, the shaft mount being a bushing and a plurality of sleeve members, the bushing has an annular body made of a material having a coefficient of linear expansion that is approximately the same as the first material, and has a tapered surface forming an angle α with respect to the center line of the shaft. are fitted onto the shaft via a key with the tapered surfaces facing each other such that the small diameter end is located inside in the direction of the center line, and the plurality of sleeve members are fitted onto the shaft through a key. The material is made of a material having approximately the same coefficient of linear expansion as the material of No. 2, and is disposed between the shaft and the annular body with the side surface in contact with the side surface of the bushing, and cooperates with the shaft. It is possible to construct an imaginary cylindrical body that is concentric with and has tapered surfaces on both sides forming an angle α with the center line of the shaft, and the angle α is the central part of the tapered surface of the bushing. It is characterized in that tanα=D/B, where the diameter of D1 is 8 and the distance between the center portions of both side surfaces of the sleeve in the direction of the center line is 8.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment.

In Figures 1 and 2, 2 is a metal shaft, and 3
is a radial ball bearing installed at @2.

A fixture 1 is arranged between the shaft 2 and the radial ball bearing 3.

The radial ball bearing 3 consists of a bearing ring made up of an inner ring 4 and an outer ring 5, and rolling elements of balls 6 held in a cage (not shown). The inner ring 4, outer ring 5, and balls 6 are each made of, for example, silicon nitride (S i 3N4)'! It is composed of ceramics.

The fixture 1 includes a pair of bushes 7a and 7b and twelve sleeve members 8 (8a to 8°C).

The sleeve parts +ia and 7b are annular bodies each made of the same material as @2 or a material having approximately the same coefficient of linear expansion. Bushes 7a and 7b have one side 11
has a tapered surface forming an angle α with respect to the center line 12 of the shaft 2. A pair of bushes 7a and 7b are attached to the shaft 2 with the key 2 facing each other with the small diameter end 13 of one tapered surface 11 facing inside in the direction of the center line 12 and the large diameter end 14 facing outside.
They are fitted through 0.

On the other hand, the sleeve member 8 (8a to 8Ω) is made of the same ceramic material as the inner ring 4 or a material having substantially the same coefficient of linear expansion. Sleeve member 8 (88~8J
2) Both sides 15a and 15b are at the center 1 of the shaft 2, respectively.
The sleeve member 8 (8a to 8n) has a tapered surface forming an angle α with respect to the side surface 15a, 15b.
The sleeve member 8 (8a to
8Ω) all work together to form a virtual cylindrical body. The virtual cylindrical body has both sides at an angle α with respect to the center line 12 of the axis 2.
It has a tapered surface. Angle α here
As shown in FIG.
The diameter of the center part of 1 is D, and the sleeve member 8 (8a ~ 8Ω)
When B is the distance between the center portions of both side surfaces 15a and 15b in the direction of the center line 12, tanα-D/B is satisfied.

"Operation" The operation when attaching the inner ring 4 of the radial ball bearing 3 to the shaft 2 using the fixture 1 having the above-described configuration is as follows.

Bushes 7a, 7b, 12 sleeve members 80~8Ω
When a fixture 1 consisting of the following is loosely assembled around a shaft 2, an inner ring 4 of a radial ball bearing 3 is fitted onto the outside of the fixture 1. At this time, the inner surface 18 of the inner ring 4 and the sleeve member 8a~
A minute gap exists between the outer surface 17 of 8Ω. From this state, when the nut 16 screwed onto the shaft 2 is rotated and the bush 7a is pushed in the direction of the center line 12 via the washer 19,
Sleeve members 8a to 8 are pinched by bushes 7a and 7b.
Ω is pushed outward along the side surface 11, and the sleeve part +
The outer surfaces 17 of A8a to 8ρ are in pressure contact with the inner surface of the inner ring 4. In this way, the inner ring 4, the sleeve members 88 to 8J2, the bushes 7a and 7b, and the shaft 2 are integrally fixed.

Next, the operation of the fixture 1 during assembly and when the temperature changes will be explained.

As shown in FIG. 3, assuming that the temperature change is the key, @2 expands in the direction of the center line 12h and in the radial direction due to this 4 degree change.

Now, considering the thermal expansion at the center part 0 of the side surface 11 of the bushes 7a, 7b, the displacement ab of the 0 point in the direction of the center line 12 due to thermal expansion is given by the linear expansion coefficient of the shaft 2 and the bushes L7a, 7b as β, and The linear expansion coefficients of the ceramic inner ring 4 and sleeve members 8a-8f2 are extremely small, so if this is ignored, ab=β8.

Here, B is the distance in the direction of the center line 12 between the center portions of both side surfaces 15a and 15b of the sleeve member.

Further, if the diameter of the center portion of the side surface 11 of the bushes 7a and 7b is D, the displacement bc of the 0 point in the IY direction due to thermal expansion is bc-βDT.

Therefore, as shown in the vector diagram in FIG. 3, the composite displacement of the O fish is aC, and bc/ab=βDT/βBT=D/B=tanα.

In other words, by setting the angle of the tapered surface of the side surface 11 of the bushings 7a, 7b and both side surfaces 15a, 15b of the sleeve members 8a to 8Q to be tanα=D/B, J means that the amount of increase due to thermal expansion in the radial direction is This is canceled out by the amount of increase due to expansion in the direction, and the sleeve members 8a to 8°C always maintain the same position in the radial direction, so that the inner ring 4 is not destroyed.

(C) Effects of the Invention As described above, according to the present invention, the displacement of the shaft in the radial direction due to temperature change can be canceled out by the change in the axial direction, and the state of the attachment part of the ring body can always be maintained. Therefore, it is possible to securely attach a ring made of a different material with a thermal expansion rate of 5.
9 can be done.

J3, the above explanation mainly refers to the case where the inner ring of the bearing is attached to the shaft.
Although the present invention has been described in an embodiment in which the rotating ring of a mechanical seal or any other ring body is attached to a shaft, the present invention can be applied to a case where a rotating ring of a mechanical seal or any other ring body is attached to a shaft.

[Brief explanation of the drawing]

Figure 1 is a vertical view of the shaft and ring body fixture of this invention;
The figure is an explanatory cross-sectional view showing the arrangement relationship between the bush, the sleeve member, and the ring body, and FIG. 3 is an explanatory longitudinal cross-sectional view showing the displacement of the center point of the side surface of the pusher 1. 1... Mounting tool 2... Shaft 3... Radial ball bearing 4... Inner ring 5... Outer ring 6... Ball
7a, 7b... Pushi J 8 (88~8Ω)...
・Sleeve member 11...Side surface 12...Center line
13...Small diameter end 14...Large diameter end 15a, 15
b...Both sides 16...Nut 17...Outer surface 18...Inner surface Fig. 1 Fig. 2

Claims (1)

[Scope of Claims] A shaft mounting tool disposed between the shaft and the ring body when the ring body made of a second material is fitted onto the shaft made of a first material; The shaft mount includes a bush and a plurality of sleeve members, and the bush is connected to the first sleeve member.
an annular body made of a material having a linear expansion coefficient substantially the same as the material of The plurality of sleeve members are made of a material having substantially the same coefficient of linear expansion as the second material, and the plurality of sleeve members are made of a material having substantially the same coefficient of linear expansion as the second material. is disposed between the shaft and the annular body in contact with the side surface of the bushing, and is concentric with the shaft and both side surfaces form an angle α with the center line of the shaft. It is possible to configure an imaginary cylindrical body having a tapered surface, and the angle α is such that the diameter of the central portion of the tapered surface of the bush is D, and the diameter of the central portion of both side surfaces of the sleeve in the center line direction is A fixture for a shaft and annular body, characterized in that when the distance is B, tanα=D/B.