JPH03288010A - Bearing device - Google Patents

Abstract

PURPOSE:To enable use with high precision at various environmental temperature by putting a rolling element between inner and outer rings whose one end is engaged with a rotary shaft and the other end is engaged with a support body in play, and energizing the inner or outer ring with which rotary shaft is not engaged in specific direction. CONSTITUTION:A bearing 10 is pressed on and supported by a support body 12 when its outer ring 11b is energized by a plate spring 14. When environmental temperature changes, space 13 which exists between the outer ring 11b and support body 12 is changed due to difference of coefficient of thermal expansion of the bearing 10 and support body 12. However, the bearing 10 is pressed on and supported by inner wall of the support body 12 because the outer ring 11b is moved and energized by the plate spring 14. Even if load such as impact is applied, the plate spring 14 bends, and is not broken because it is made of metal. Thus, it is possible to realize support of rotary shaft with high precision without being affected by changes of temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a bearing device suitable for a drive mechanism of an antenna device mounted on an artificial satellite, for example.

(Prior Art) Generally, in a bearing device, a bearing is provided in a rotation support part of a drive mechanism, etc., and has an outer ring rotatably combined with an inner ring to which a rotating shaft is fitted, with rolling elements interposed. It is housed in a housing. This bearing is mounted, for example, by a so-called interference fit, in which the rotating shaft is fitted to the inner ring with a certain interference fit, and a support such as a nosing is fitted to the other outer ring with a certain clearance. It is installed by a loose fit with a loose fit. This is to prevent excessive load from being applied to the rolling elements due to the whitening.

By the way, when such a bearing device is used in an environment with a wide operating temperature range such as outer space, due to the difference in thermal expansion coefficient between the material of the outer ring and the material of the support body,
Since the amount of voids changes depending on the temperature, it is necessary to take large voids in advance and arrange them in combination, so there is a problem that so-called "backlash" occurs depending on the environmental temperature.

Therefore, as shown in FIG. 2, a conventional bearing device used in such an environment with a wide operating temperature range is a bearing device that is arranged in combination with an inner ring 2a to which a rotating shaft 1 is fitted, via rolling elements 2b. There is one in which a polymer material 3 is attached to the outer ring 2C facing a support (not shown) such as a housing.

This polymer material 3 is applied to the outer ring 2 in advance as the environmental temperature changes.
The material and dimensions are set to fill the gap that occurs between C and the support (not shown), and "backlash" is prevented by filling the gap that occurs due to temperature changes.

However, since the above-mentioned bearing device uses the polymer material 3, its strength is low, and it is difficult to use it in an environment where it is subjected to large shocks or loads.
There are also problems in that the material releases a large amount of gas, making it difficult to use in a vacuum, or the temperature range in which it can be used is narrow, limiting the environment in which it can be applied. For this reason, it has been difficult to use it directly in the space environment, where, for example, the spacecraft is subject to excessive shock when launched into space, and is also exposed to a vacuum and severe temperature environment.

(Problems to be Solved by the Invention) As described above, conventional bearing devices have problems in that they are subject to large shocks and loads, and are difficult to use in environments with severe temperatures.

This invention has been made in view of the above circumstances, and provides a bearing device that is robust, can support a rotating shaft with high precision, and can be used with high precision at various environmental temperatures. The purpose is to

[Structure of the Invention] (Means for Solving the Problems) This invention provides a combination arrangement in which rolling elements are interposed between an inner ring and an outer ring, one of which is fitted onto a rotating shaft and the other is fitted loosely into a support. A bearing device is constructed by comprising a bearing and a biasing means for biasing an inner ring or an outer ring to which a rotating shaft of the bearing is not fitted in a specific direction.

(Function) According to the above configuration, the unfitted inner ring or outer ring of the rotating shaft is always pressed against the support body by being urged in a specific direction by the urging means.

Therefore, even if the amount of gap between the inner ring or the outer ring and the support body changes, the urging force of the urging means presses the inner ring or the outer ring against each other, thereby preventing "backlash" between the inner ring and the outer ring.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a bearing device according to an embodiment of the present invention, in which a bearing 10 is arranged such that an outer ring 10b is freely rotatable with an inner ring 10a to which a rotating shaft 11 is fitted, and an outer ring 10b is interposed between rolling elements 10c. be done. This bearing 10 is loosely fitted into a support 12 called a housing with a predetermined gap 13, and a leaf spring member 14 is attached to this gap 13. Leaf spring member 1
4, both ends are in contact with the inner wall of the support body 12, and the middle part is in contact with the outer ring 10.
touches b.

Note that the amount of deflection of the gap 13 and the leaf spring member 14 is set in consideration of the difference in coefficient of thermal expansion between the bearing 10 and the support body 12, the operating environment temperature, and the like.

In the above configuration, the outer ring 10b of the bearing 10 is urged by the urging force of the leaf spring member 14, pressed against the support body 12, and supported by the urging force. When the environmental temperature changes, the gap 13 existing between the outer ring 10b and the support 12 is varied due to the difference in thermal expansion coefficients between the bearing 10 and the support 12. However, the bearing 10
Since the outer ring 10b is urged to move by the leaf spring member 14, it is similarly pressed against and supported by the inner wall of the support body 12.

Further, even when a load such as an impact is applied, the leaf spring member 14 interposed between the outer ring 10b and the support body 12 is bent and pinched between the outer ring 10b and the support body 12, but the position spring member 14 is Since it is made of metal, there is no risk of damage.

In this manner, the bearing device has the leaf spring member 14 interposed between the outer ring 10b of the bearing 10 and the support 12, and the outer ring 10b is pressed against the inner wall of the support 12 by the biasing force of the leaf spring member 14. By this, attachment to the support body 12 is realized.

According to this, even if the gap 13 between the outer ring 10b of the bearing 10 and the support body 12 changes due to a temperature change, the change in the gap can be absorbed by the biasing force of the leaf spring member 14. As a result, it is possible to reliably prevent "backlash" between the two parts, thereby realizing highly accurate rotating shaft support without being affected by temperature changes. Moreover, according to this, even if an excessive load is applied to the bearing 10, there is no risk of breakage or the like. Therefore, this is particularly suitable for use in space, where the device is exposed to severe temperature environments and is subjected to loads such as excessive vibrations during launch into outer space.

Although the above embodiment is configured using one leaf spring member 14, the configuration is not limited to this, and it is also possible to use, for example, a coil spring or a combination of multiple spring members. .

Further, in the above embodiment, the rotating shaft 11 is fitted to the inner ring 10a and the outer ring 11b is attached to the support body 12, but the invention is not limited to this. It is also possible to configure

Furthermore, the present invention is not limited to use in outer space, but can be applied in various environments such as on the ground.

Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As detailed above, according to the present invention, it can be made robust,
It is possible to provide a bearing device that can support a rotating shaft with high precision and can be used with high precision at various environmental temperatures.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a bearing device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional bearing device. DESCRIPTION OF SYMBOLS 10... Bearing, 10a... Inner ring, 10b... Outer ring, 10c... Rolling element, 11... Rotating shaft, 12...
Support body, 13... void, 14... plate spring member.

Claims (1)

[Claims] Identify bearings arranged in combination with rolling elements interposed between an inner ring and an outer ring, one of which is fitted to the rotating shaft and the other is loosely fitted to the support, and the inner ring or outer ring to which the rotating shaft of this bearing is not fitted. 1. A bearing device comprising a biasing means for biasing in the direction of.