JPH05139397A - Radiating structure of rotating shaft - Google Patents

Abstract

PURPOSE:To precisely support a rotating shaft without influence due to the variation of environmental temperature by uniforming a temperature difference between the rotating shaft and a housing. CONSTITUTION:Plural number of radiating plates 13 are provided at fixed intervals on the middle part of a rotating shaft 10, and plural number of radiating plates 14 severally provided face-to-face to the radiating plates 13 on the rotating shaft 10 are provided at fixed intervals in a housing 12 where the middle part of the rotating shaft 10 is rotatably accommodated through bearings 11. Thus mutual heat transfer among the above components is executed through the radiating action of the radiating plates 13, 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmission mechanism of a solar cell paddle mounted on a spacecraft such as an artificial satellite and a rotation transmission mechanism used in a vacuum environment such as an antenna driving device, The present invention relates to a heat dissipation structure for a rotating shaft.

[0002]

2. Description of the Related Art Generally, this type of rotation transmission mechanism is shown in FIG.
As shown in, one end of the rotary shaft 1 is connected to a drive source (not shown), and the other end is connected to a drive target (not shown). The intermediate portion of the rotary shaft 1 is housed in the housing 3 via the bearing 2, and the housing 3 is exposed to the space environment which is a vacuum environment. A vacuum is also created between the rotary shaft 1 and the housing 3.

However, in the above rotation transmission mechanism, when the housing 3 exposed to the space environment is heated or cooled and its ambient temperature changes greatly, heat transfer by air due to the vacuum environment unlike the ground environment. Since it is difficult, the temperature difference between the housing 3 and the rotary shaft 1 becomes very large, and it becomes difficult to support the bearing 2 with high accuracy.

Therefore, as a measure against heat, for example, the bearing 2 is
Designing assuming that the rotating shaft 1 is at high temperature and the housing 3 is at low temperature, the internal clearance of the bearing 2 becomes large when the temperature difference between them is small or when the temperature of the rotating shaft 1 is low.
High-precision support becomes difficult. Therefore, in the rotation transmission mechanism used in such a space environment, a thermal design considering the ambient temperature is required to manufacture the bearing 2, and the manufacturing thereof is very troublesome. It was Further, a complicated deformation occurs due to the difference in the coefficient of thermal expansion between the materials of the rotating shaft 1 and the housing 3.

[0005]

As described above, since the space rotation transmission mechanism must be designed so as not to be affected by the environmental temperature change, its manufacture is very troublesome. Had the problem of being.

The present invention has been made in view of the above circumstances, and aims to make the temperature difference between the rotary shaft and the housing uniform.
It is an object of the present invention to provide a heat dissipation structure for a rotating shaft that can realize highly accurate support of the rotating shaft.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a rotating shaft having a plurality of heat radiating plates provided at predetermined intervals in an intermediate portion of which one end is connected to a drive source and the other end is connected to a drive target. A vacuum environment in which a middle portion of a rotating shaft is rotatably accommodated through a bearing, and a plurality of heat radiating plates facing the heat radiating plate of the rotating shaft are provided inside at a predetermined interval. And a housing that is exposed to the heat radiation structure of the rotating shaft.

[0008]

According to the above construction, since the heat dissipation plates of the rotary shaft and the housing are opposed to each other to secure a sufficient facing area, the radiation effects of the heat dissipation plates are caused by the rotation of the rotary shaft. The amount of heat is transferred from the high temperature side to the low temperature side, and the mutual temperature difference is made uniform.

[0009]

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

FIG. 1 shows a heat dissipating structure for a rotary shaft according to an embodiment of the present invention. In the figure, 10 is a rotary shaft, one end of which is connected to a drive motor (not shown) and the other end of which is an antenna drive (not shown). It is connected to a drive target such as a mechanism. The intermediate portion of the rotating shaft is housed in the housing 12 via the bearing 11. The rotary shaft 10 has a plurality of ring-shaped heat dissipation plates 13
, Are erected and fixed so as to be substantially orthogonal to the axial direction of the rotating shaft 10 with a predetermined interval.

A plurality of ring-shaped heat dissipation plates 14 are fixed in the housing 12 so as to face the heat dissipation plates 13 of the rotary shaft 10 at predetermined intervals. The plurality of heat radiating plates 14 are respectively interposed between the heat radiating plates 13 of the rotary shaft 10 and face the heat radiating plate 13 of the rotary shaft 10 so as to face each other.

In the above structure, the heat amounts of the rotating shaft 10 and the housing 12 are mutually opposed without affecting the rotation of the rotating shaft 10 because the heat radiating plates 13 and 14 are opposed to each other. Heat is transferred from the high temperature side to the low temperature side by the radiation effect of the heat dissipation plates 13 and 14. This allows
The rotating shaft 10 and the housing 12 have a uniform temperature difference.

Further, the rotating shaft 10 and the housing 12
By applying black coating to each of the heat dissipation plates 13 and 14, the emissivity and absorptivity of the heat dissipation plates 13 and 14 can be improved, the emission characteristics can be improved, and more excellent emission characteristics can be obtained.

As described above, in the heat dissipation structure of the rotating shaft, the plurality of heat dissipation plates 13 are provided in the intermediate part of the rotating shaft 10 at predetermined intervals, and the intermediate part of the rotating shaft 10 is rotatable via the bearing 11. By disposing a plurality of heat radiating plates 14 facing the heat radiating plate 13 of the rotary shaft 10 in the housing 12 to be opposed to each other at a predetermined interval, the heat radiating action of these heat radiating plates 13 and 14 causes heat between the heat radiating plates 13 and 14. It is configured to communicate. According to this, the rotating shaft 10 and the housing 12 have a high amount of heat due to the radiation action of the heat sinks 13 and 14 because the heat sinks 13 and 14 face each other and a sufficient facing area is secured. Since the heat is transferred from the side to the low temperature side and the mutual temperature difference is made uniform, the internal clearance of the bearing 11 can be narrowed to the minimum, so that the precision of the rotation transmitting mechanism can be easily improved. ..

The present invention is not limited to the above embodiment, but may be constructed as shown in FIG. 2, for example. That is, the support fitting 15 is erected and fixed to the rotating shaft 10a in a direction substantially orthogonal to the axial direction, and a plurality of substantially cylindrical heat dissipation plates 13a having different diameters are concentric with the axial direction. Stick to. The housing 12a is also provided with a plurality of radiation plates 14a each having a substantially cylindrical shape and having different diameters.
3a is fixed concentrically with the axial direction so as to be opposed to 3a. As a result, the heat dissipation plate 13a,
Due to the radiation action between the rotating shafts 14a, the amount of heat of the rotating shaft 10a and the housing 12a is transferred from the high temperature side to the low temperature side with the rotational driving of the rotating shaft 10a, and the temperature difference is made uniform. In addition, also in FIG. 2, the rotary shaft 1
0a and the heat radiating plates 13a and 14a of the housing 12a are painted in black, the radiation characteristics can be further improved, and good or good effects are expected. Therefore, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

[0016]

As described above in detail, according to the present invention, the temperature difference between the rotating shaft and the housing is made uniform, and the rotating shaft is radiated in a highly accurate manner. A structure can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a heat dissipation structure of a rotating shaft according to an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram shown for explaining a conventional problem.

[Explanation of symbols]

10, 10a ... Rotating shaft, 11, 11a ... Bearing, 12, 1
2a ... Housing, 13, 13a ... Heat sink, 14, 14
a ... heat sink, 15 ... support metal fittings.

Claims (2)

[Claims] 1. A rotating shaft having a plurality of heat radiating plates provided at predetermined intervals in an intermediate part of which one end is connected to a drive source and the other end is connected to a driven object, and an intermediate part of the rotating shaft forms a bearing. The housing is rotatably accommodated through the inside of the housing and is provided with a housing which is exposed to a vacuum environment in which a plurality of heat radiation plates opposed to the heat radiation plate of the rotating shaft are provided at predetermined intervals. The heat dissipation structure of the rotating shaft. 2. The heat dissipation structure for a rotary shaft according to claim 1, wherein the heat dissipation plate for the rotary shaft and the heat dissipation plate for the housing are each painted black.